Solve y = x²: Finding Points Where y Equals 4

Given the function:

y=x2 y=x^2

Is there a point for ? y=4 y=4 ?

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Set up and solve
00:03 Let's substitute appropriate values according to the given data, and solve for X
00:13 Take the root
00:16 When taking a root there are 2 solutions, positive and negative
00:28 These are the 2 points
00:31 And this is the solution to the question

Step-by-step written solution

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1

Understand the problem

Given the function:

y=x2 y=x^2

Is there a point for ? y=4 y=4 ?

2

Step-by-step solution

To determine if there is a point on the graph of the parabola y=x2 y = x^2 where y=4 y = 4 , we need to find values of x x that satisfy the equation x2=4 x^2 = 4 .

Let's solve the equation step by step:

  • Set the equation: x2=4 x^2 = 4 .
  • Take the square root of both sides to solve for x x :
  • x=4 x = \sqrt{4} or x=4 x = -\sqrt{4} .
  • This gives us x=2 x = 2 or x=2 x = -2 .

Therefore, the points on the graph where y=4 y = 4 are (2,4) (2, 4) and (2,4)(-2, 4) .

This matches the provided correct answer of (2,4) (2, 4) and (2,4)(-2, 4) .

Therefore, the correct solution is the point set (2,4) (2, 4) and (2,4)(-2, 4) .

3

Final Answer

(2,4) (2,4) (2,4) (-2,4)

Practice Quiz

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What is the value of y for the function?

\( y=x^2 \)

of the point \( x=2 \)?

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