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how do you know if a quadratic equation has no solution

by Mr. Stephan Stiedemann MD Published 3 years ago Updated 2 years ago

There are a few ways to tell when a quadratic equation has no solution:

  • Look at the discriminant – if it is negative, there is no real solution to the quadratic.
  • Look at the graph – if the parabola never touches the x-axis, there is no real solution to the quadratic.
  • Look at the coefficients – there are some special cases that will tell you when there is no real solution to the quadratic (more on this later in the article!)

ax2 + bx + c = 0
There is a special case that will tell us if a quadratic has no real solution: if b = 0 when a and c share the same sign (both positive or both negative), then there will be no real solution. The quadratic formula becomes much simpler when b = 0.

What are examples of equations with no solutions?

Solution:

  1. Multiply equation 1 by 4
  2. Then we will get 4X + 4Y = 8
  3. Now subtract this from equation 2

How do I calculate a quadratic equation?

A quadratic equation should at least have one squared variable. To do this, you can simply multiply the variable by itself, calculate he 2 nd power of the variable using the power operator ^ or use the POWER function as in our example. The other important part is to refer a cell as variable, x.

When does a quadratic have no solution?

When working with quadratic equations, we often see one or two real solutions. However, it is also possible that a quadratic will have no real solution. So, when does a quadratic have no solution? A quadratic equation has no solution when the discriminant is negative. From an algebra standpoint, this means b2 < 4ac.

How to factor any quadratic equation easily?

  • Since the equation will yield two solutions for x, we have two x-intercepts
  • We will have a parabola
  • We can start plotting the parabola with two ordered pairs, (x1, 0) ( x 1, 0) and (x2, 0) ( x 2, 0)
  • The vertex of the parabola will be between the two x-intercepts

How do you tell if an equation has no solution?

The constants are the numbers alone with no variables. If the coefficients are the same on both sides then the sides will not equal, therefore no solutions will occur.

How do you know if an equation has real solution?

0:3011:15How To Determine The Number of Real and Imaginary Solutions ...YouTubeStart of suggested clipEnd of suggested clipIf the discriminant is equal to zero. Then you're going to have one real solution if theMoreIf the discriminant is equal to zero. Then you're going to have one real solution if the discriminant is less than zero.

How do you check if the solutions of the quadratic equation?

So the quadratic formula tells us that if we have an equation of the form ax squared plus bx plus c is equal to 0, that the solutions are going to be-- or the solution if it exists is going to be-- negative b plus or minus the square root of b squared minus 4ac.

Do quadratic equations have no real solutions?

3:434:49Quadratic Equations With No Real Solution - YouTubeYouTubeStart of suggested clipEnd of suggested clipI should say two real solutions. Here's an example of a graph with one real solution it just touchesMoreI should say two real solutions. Here's an example of a graph with one real solution it just touches the x axis in one place. All right here is an example another example of a quadratic function where

What does it mean if an equation has no real solutions?

No solution would mean that there is no answer to the equation. It is impossible for the equation to be true no matter what value we assign to the variable. Infinite solutions would mean that any value for the variable would make the equation true.

What are real solutions in quadratic equation?

If the value of the discriminant is positive, there are two real solutions for x, meaning the graph of the solution has two distinct x-intercepts. If the value of the discriminant is zero, there is one real solution for x, meaning the graph of the solution has one x-intercept.

How many solutions does a quadratic equation have?

two solutionsA quadratic equation with real or complex coefficients has two solutions, called roots.

How do you know if a quadratic equation has no real roots?

If the discriminant is greater than zero, this means that the quadratic equation has no real roots. Therefore, there are no real roots to the quadratic equation 3x2 + 2x + 1. If the discriminant is equal to zero, this means that the quadratic equation has two real, identical roots.

How can you tell from the graph of a quadratic function whether it has no real zeros?

If the discriminant of a quadratic function is less than zero, that function has no real roots, and the parabola it represents does not intersect the x-axis.

Do all quadratic equations have solutions?

Does A Quadratic Equation Always Have Two Solutions? In terms of real solutions, there are always either 0, 1, or 2 real solutions to a quadratic equation, depending on the sign of the discriminant. However, there is always at least 1 solution if you count both real and complex numbers.

What does no solution mean?

The solution x = 0 means that the value 0 satisfies the equation, so there is a solution. “No solution” means that there is no value, not even 0, which would satisfy the equation. Also, be careful not to make the mistake of thinking that the equation 4 = 5 means that 4 and 5 are values for x that are solutions.

What is an example of a quadratic function with no real roots?

Notice that the discriminant of f (x) is negative, b2 −4ac = (−3)2− 4 · 1 · 4 = 9 − 16 = −7. This function is graphically represented by a parabola that opens upward whose vertex lies above the x-axis.

What does "no solution" mean?

“No solution” means that there is no value, not even 0, which would satisfy the equation.

What happens when the square root is negative?

If the expression under the square root is negative, then the quadratic equation will have zero real solutions. It follows, then, that when there are no real solutions to a quadratic equation, the graph of the equation will have zero x-intercepts, meaning that the parabola will never intersect the x-axis.

What is the general solution of a quadratic equation?

The points from this paragraph are direct consequences of the way to find the solution, completing the square. The general solution is the quadratic formula which will be ( − b ± D) / ( 2 a) where D is the discriminant, b 2 − 4 a c. It is the value of the discriminant that generates the i part of any solution of the quadratic equation. with real constants

What is the standard form of a quadratic equation?

The standard form of the quadratic equation is a x ^2 + b x + c = 0, where a, b, c are constants ( a non-zero). The solutions are given by the well-known quadratic formula: x = {- b + [ ( b ^2) - 4 ac ]^1/2}/2 a and x = {- b- [ ( b ^2) - 4 ac ]^1/2}/2 a. The quantity [ ( b ^2) - 4 ac ]^1/2 involves a square root, which means that the radicand (also called the Discriminant), ( b ^2) - 4 ac, must be non-negative for REAL roots.

What is the solution of the quadratic equation ax2 + bx + c?

The quadratic equation ax^2 + bx + c = 0 (where a is not 0) has no real solutions if b^2- 4ac < 0.

What is the discriminant of a quadratic formula?

The discriminant is b^2 - 4ac. It comes from the quadratic formula.

How to find roots of a quadratic function?

The roots to a quadratic function is given by the quadratic equation: - (b+/-sqrt ( (b^2)-4ac))/2a where the quadratic equation is in the form ax^2+bx+c. The value of non-real roots will be determined by the value of b^2)-4ac. If the value is negative, there will be imaginary roots and no real solution.

What is the general solution of a square?

The points from this paragraph are direct consequences of the way to find the solution, completing the square. The general solution is the quadratic formula which will be ( − b ± D) / ( 2 a) where D is

What happens if the discriminant is 0?

So if the discriminant is >= 0 Then it can have 1 or 2 solutions ( real number solutions ). But if the discriminant is < 0 Then there are no real number solutions.

Who created the system of two quadratic equations?

He then graphs the equations to show that this is true. Created by Sal Khan and Monterey Institute for Technology and Education.

Can you graph a parabola on an imaginary axis?

It is used to visualize an imaginary point, so technically you can't graph a parabola on an imaginary axis. The two parabolas from the video won't intersect on the real axis, which means they won't intersect at all.

How to tell if a quadratic has only one solution?

The first way to tell if a quadratic has one solution is to look at the discriminant. If the discriminant is zero, then the quadratic equation has only one real solution.

How to tell if a quadratic equation has one real solution?

You can also look at the coefficients of a quadratic equation in standard form to tell if it has one real solution. Remember that the standard form of a quadratic equation has zero on one side, and terms in descending order on the other:

What happens if the vertex of the parabola rests on the x-axis?

Look at the graph – if the vertex of the parabola rests on the x-axis, there is only one solution to the quadratic.

What is the vertex of a quadratic equation?

As you can see, the quadratic function f (x) = x 2 – 4x + 4 has its vertex (valley bottom) on the x axis at x = 2. This means the quadratic equation has one real solution.

What happens if the discriminant is zero?

If the discriminant is zero, there is exactly one real solution (a repeated root: the same real number appears as a solution twice).

How many real solutions are there for a discriminant?

If the discriminant is positive, there are exactly 2 real solutions. If the discriminant is zero, there is exactly one real solution (a repeated root). If the discriminant is negative, there are exactly 2 complex solutions (they are complex conjugates). Remember that two complex conjugates have the form a + bi and a – bi.

How many real solutions are there in a quadratic equation?

In terms of real solutions, there are always either 0, 1, or 2 real solutions to a quadratic equation, depending on the sign of the discriminant.

How many solutions does a quadratic equation have?

The short answer is, it is easy: They all have two solutions. The Fundamental Theorem of Algebra guarantees it. Now if what you really meant to ask is: How do you know if a quadratic equation will have one, two, or no solutions over the real numbers, then read on.

How to find solutions from an equation?

One way to find solutions from the equation is to factor it. For example, solving

What is the key in a quadratic formula?

The key is the expression in the square root: . In general there are three cases: is positive. The square root of a positive number is also some positive number. So in the numerator of the quadratic formula we will get two values: (-b + the square root) and (-b - the square root). So when we get two solutions.

What is the expression under the radical in the general solution called?

The expression under the radical in the general solution, namely is called the discriminant . The discriminant can be evaluated to determine the character of the solutions of a quadratic equation, thus:

Why are equations and equivalent?

So while it is true that is different than (see graphs below), the equations and are equivalent because you can multiply the second one by to obtain the first. Note that the graphs intersect the -axis at the same points:

What is the square root of zero?

is zero. The square root of zero is zero. So in the numerator we get (-b + 0) and (-b - 0). But both of these are equal to -b! So when we only get one solution.

Is an analogous function the same as a different graph?

Since the equations are equivalent, it is a stretch, for me anyway, to call them 'different.' However, what is true is that the analogous functions, i.e. are very different in that they all have different graphs.

How to find how many solutions an equation has?

Explanation: When finding how many solutions an equation has you need to look at the constants and coefficients. The coefficients are the numbers alongside the variables. The constants are the numbers alone with no variables. If the coefficients are the same on both sides then the sides will not equal, therefore no solutions will occur.

Why does the left side of the equation not satisfy the equation?

The left side does not satisfy the equation because the fraction cannot be divided by zero.

What happens if you substitute two solutions back to the original equation?

The answer to is: If we substitute these two solutions back to the original equation, the results are positive answers and can never be equal to negative one. The answer is no solution.

What would happen if equation 1 was solved for a variable and then substituted into the second equation?

This is because these two equations have No solution. Change both equations into slope-intercept form and graph to visualize. These lines are parallel; they cannot intersect.

Is the end value of a value positive or negative?

Notice that the end value is a negative. Any negative or positive value that is inside an absolute value sign must result to a positive value.

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