Question

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

Answer 1

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.

Answer 2

`x=+2√(10)`

`x=-2√(10)`

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

`√(x^2) =√(40)`

`x=+-2√(10)`

The values of x are

`x=+2√(10)`

`x=-2√(10)`