x(x+8)=128

Solution for x(x+8)=128 equation:

Simplifying
x(x + 8) = 128

Reorder the terms:
x(8 + x) = 128
(8 * x + x * x) = 128
(8x + x2) = 128

Solving
8x + x2 = 128

Solving for variable 'x'.

Reorder the terms:
-128 + 8x + x2 = 128 + -128

Combine like terms: 128 + -128 = 0
-128 + 8x + x2 = 0

Factor a trinomial.
(-16 + -1x)(8 + -1x) = 0

Subproblem 1
Set the factor '(-16 + -1x)' equal to zero and attempt to solve:

Simplifying
-16 + -1x = 0

Solving
-16 + -1x = 0

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

Add '16' to each side of the equation.
-16 + 16 + -1x = 0 + 16

Combine like terms: -16 + 16 = 0
0 + -1x = 0 + 16
-1x = 0 + 16

Combine like terms: 0 + 16 = 16
-1x = 16

Divide each side by '-1'.
x = -16

Simplifying
x = -16
Subproblem 2
Set the factor '(8 + -1x)' equal to zero and attempt to solve:

Simplifying
8 + -1x = 0

Solving
8 + -1x = 0

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

Add '-8' to each side of the equation.
8 + -8 + -1x = 0 + -8

Combine like terms: 8 + -8 = 0
0 + -1x = 0 + -8
-1x = 0 + -8

Combine like terms: 0 + -8 = -8
-1x = -8

Divide each side by '-1'.
x = 8

Simplifying
x = 8
Solution
x = {-16, 8}