4r^2+8r+4=100

Solution for 4r^2+8r+4=100 equation:

Simplifying
4r2 + 8r + 4 = 100

Reorder the terms:
4 + 8r + 4r2 = 100

Solving
4 + 8r + 4r2 = 100

Solving for variable 'r'.

Reorder the terms:
4 + -100 + 8r + 4r2 = 100 + -100

Combine like terms: 4 + -100 = -96
-96 + 8r + 4r2 = 100 + -100

Combine like terms: 100 + -100 = 0
-96 + 8r + 4r2 = 0

Factor out the Greatest Common Factor (GCF), '4'.
4(-24 + 2r + r2) = 0

Factor a trinomial.
4((-6 + -1r)(4 + -1r)) = 0

Ignore the factor 4.
Subproblem 1
Set the factor '(-6 + -1r)' equal to zero and attempt to solve:

Simplifying
-6 + -1r = 0

Solving
-6 + -1r = 0

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

Add '6' to each side of the equation.
-6 + 6 + -1r = 0 + 6

Combine like terms: -6 + 6 = 0
0 + -1r = 0 + 6
-1r = 0 + 6

Combine like terms: 0 + 6 = 6
-1r = 6

Divide each side by '-1'.
r = -6

Simplifying
r = -6
Subproblem 2
Set the factor '(4 + -1r)' equal to zero and attempt to solve:

Simplifying
4 + -1r = 0

Solving
4 + -1r = 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 + -1r = 0 + -4

Combine like terms: 4 + -4 = 0
0 + -1r = 0 + -4
-1r = 0 + -4

Combine like terms: 0 + -4 = -4
-1r = -4

Divide each side by '-1'.
r = 4

Simplifying
r = 4
Solution
r = {-6, 4}