x^2+24x+144=81

Solution for x^2+24x+144=81 equation:

Simplifying
x2 + 24x + 144 = 81

Reorder the terms:
144 + 24x + x2 = 81

Solving
144 + 24x + x2 = 81

Solving for variable 'x'.

Reorder the terms:
144 + -81 + 24x + x2 = 81 + -81

Combine like terms: 144 + -81 = 63
63 + 24x + x2 = 81 + -81

Combine like terms: 81 + -81 = 0
63 + 24x + x2 = 0

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

Subproblem 1
Set the factor '(21 + x)' equal to zero and attempt to solve:

Simplifying
21 + x = 0

Solving
21 + x = 0

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

Add '-21' to each side of the equation.
21 + -21 + x = 0 + -21

Combine like terms: 21 + -21 = 0
0 + x = 0 + -21
x = 0 + -21

Combine like terms: 0 + -21 = -21
x = -21

Simplifying
x = -21
Subproblem 2
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
Solution
x = {-21, -3}