Question

What are the solution(s) to the quadratic equation 40 − x2 = 0?

Answer 1

Answer:

$x=+2\sqrt{10}$

$x=-2\sqrt{10}$

Step-by-step explanation:

$40-x^2=0$

To solve for x , subtract 40 from both sides

$-40+40-x^2=0-40$

$-x^2=-40$

Divide both sides by -1

$x^2= 40$

Take square root on both sides

$\sqrt{x^2} =\sqrt{40}$

$x=+-2\sqrt{10}$

The values of x are

$x=+2\sqrt{10}$

$x=-2\sqrt{10}$

Answer 2

X = 20
First, you move the 40 to the other side.
-2x=-40
Then, you divided -40 by -2.
x= -40/-2
x= 20
x is 20 because the negatives cancel out making it positive.