(x+5)(x-5)=-9

Solution for (x+5)(x-5)=-9 equation:

Simplifying
(x + 5)(x + -5) = -9

Reorder the terms:
(5 + x)(x + -5) = -9

Reorder the terms:
(5 + x)(-5 + x) = -9

Multiply (5 + x) * (-5 + x)
(5(-5 + x) + x(-5 + x)) = -9
((-5 * 5 + x * 5) + x(-5 + x)) = -9
((-25 + 5x) + x(-5 + x)) = -9
(-25 + 5x + (-5 * x + x * x)) = -9
(-25 + 5x + (-5x + x2)) = -9

Combine like terms: 5x + -5x = 0
(-25 + 0 + x2) = -9
(-25 + x2) = -9

Solving
-25 + x2 = -9

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '25' to each side of the equation.
-25 + 25 + x2 = -9 + 25

Combine like terms: -25 + 25 = 0
0 + x2 = -9 + 25
x2 = -9 + 25

Combine like terms: -9 + 25 = 16
x2 = 16

Simplifying
x2 = 16

Take the square root of each side:
x = {-4, 4}