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

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

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

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

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

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

Combine like terms: 1x + 9x = 10x
(1 + 10x + 9x2) = 0

Solving
1 + 10x + 9x2 = 0

Solving for variable 'x'.

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

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

Simplifying
1 + x = 0

Solving
1 + x = 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 + x = 0 + -1

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

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

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

Simplifying
1 + 9x = 0

Solving
1 + 9x = 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 + 9x = 0 + -1

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

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

Divide each side by '9'.
x = -0.1111111111

Simplifying
x = -0.1111111111
Solution
x = {-1, -0.1111111111}