I need help algebra

Question

f(x)=_-x² -4

find the value of x if f(x) = -29

Answer 1

If f(x) = -29 then we can put "-29" in place of "f(x)" wherever we see it, So since f(x) = -x² - 4 then we can say -29 = -x² - 4 [now add 4 to each side of the equation to get:

-25 = -x² [now we can multiply both sides by -1 to get:

25 = x² [now we can take the square root of both sides

so x = 5 because 5² = 25

But, x can also be -5 because (-5)² also equals 25.

So the answers are x = 5 and x = -5