x(2x+9)=-9

Solution for x(2x+9)=-9 equation:

Simplifying
x(2x + 9) = -9

Reorder the terms:
x(9 + 2x) = -9
(9 * x + 2x * x) = -9
(9x + 2x2) = -9

Solving
9x + 2x2 = -9

Solving for variable 'x'.

Reorder the terms:
9 + 9x + 2x2 = -9 + 9

Combine like terms: -9 + 9 = 0
9 + 9x + 2x2 = 0

Factor a trinomial.
(3 + x)(3 + 2x) = 0

Subproblem 1
Set the factor '(3 + x)' equal to zero and attempt to solve:

Simplifying
3 + x = 0

Solving
3 + x = 0

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

Add '-3' to each side of the equation.
3 + -3 + x = 0 + -3

Combine like terms: 3 + -3 = 0
0 + x = 0 + -3
x = 0 + -3

Combine like terms: 0 + -3 = -3
x = -3

Simplifying
x = -3
Subproblem 2
Set the factor '(3 + 2x)' equal to zero and attempt to solve:

Simplifying
3 + 2x = 0

Solving
3 + 2x = 0

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

Add '-3' to each side of the equation.
3 + -3 + 2x = 0 + -3

Combine like terms: 3 + -3 = 0
0 + 2x = 0 + -3
2x = 0 + -3

Combine like terms: 0 + -3 = -3
2x = -3

Divide each side by '2'.
x = -1.5

Simplifying
x = -1.5
Solution
x = {-3, -1.5}