r^2+12r+36=4

Solution for r^2+12r+36=4 equation:

Simplifying
r2 + 12r + 36 = 4

Reorder the terms:
36 + 12r + r2 = 4

Solving
36 + 12r + r2 = 4

Solving for variable 'r'.

Reorder the terms:
36 + -4 + 12r + r2 = 4 + -4

Combine like terms: 36 + -4 = 32
32 + 12r + r2 = 4 + -4

Combine like terms: 4 + -4 = 0
32 + 12r + r2 = 0

Factor a trinomial.
(8 + r)(4 + r) = 0

Subproblem 1
Set the factor '(8 + r)' equal to zero and attempt to solve:

Simplifying
8 + r = 0

Solving
8 + r = 0

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

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

Combine like terms: 8 + -8 = 0
0 + r = 0 + -8
r = 0 + -8

Combine like terms: 0 + -8 = -8
r = -8

Simplifying
r = -8
Subproblem 2
Set the factor '(4 + r)' equal to zero and attempt to solve:

Simplifying
4 + r = 0

Solving
4 + r = 0

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

Add '-4' to each side of the equation.
4 + -4 + r = 0 + -4

Combine like terms: 4 + -4 = 0
0 + r = 0 + -4
r = 0 + -4

Combine like terms: 0 + -4 = -4
r = -4

Simplifying
r = -4
Solution
r = {-8, -4}