(x+9)(x-1)=0

Solution for (x+9)(x-1)=0 equation:

Simplifying
(x + 9)(x + -1) = 0

Reorder the terms:
(9 + x)(x + -1) = 0

Reorder the terms:
(9 + x)(-1 + x) = 0

Multiply (9 + x) * (-1 + x)
(9(-1 + x) + x(-1 + x)) = 0
((-1 * 9 + x * 9) + x(-1 + x)) = 0
((-9 + 9x) + x(-1 + x)) = 0
(-9 + 9x + (-1 * x + x * x)) = 0
(-9 + 9x + (-1x + x2)) = 0

Combine like terms: 9x + -1x = 8x
(-9 + 8x + x2) = 0

Solving
-9 + 8x + x2 = 0

Solving for variable 'x'.

Factor a trinomial.
(-9 + -1x)(1 + -1x) = 0

Subproblem 1
Set the factor '(-9 + -1x)' equal to zero and attempt to solve:

Simplifying
-9 + -1x = 0

Solving
-9 + -1x = 0

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

Add '9' to each side of the equation.
-9 + 9 + -1x = 0 + 9

Combine like terms: -9 + 9 = 0
0 + -1x = 0 + 9
-1x = 0 + 9

Combine like terms: 0 + 9 = 9
-1x = 9

Divide each side by '-1'.
x = -9

Simplifying
x = -9
Subproblem 2
Set the factor '(1 + -1x)' equal to zero and attempt to solve:

Simplifying
1 + -1x = 0

Solving
1 + -1x = 0

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

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

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

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

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

Simplifying
x = 1
Solution
x = {-9, 1}