r^2-5r-8=-8

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Solution for r^2-5r-8=-8 equation: 


Simplifying
r2 + -5r + -8 = -8

Reorder the terms:
-8 + -5r + r2 = -8

Add '8' to each side of the equation.
-8 + -5r + 8 + r2 = -8 + 8

Reorder the terms:
-8 + 8 + -5r + r2 = -8 + 8

Combine like terms: -8 + 8 = 0
0 + -5r + r2 = -8 + 8
-5r + r2 = -8 + 8

Combine like terms: -8 + 8 = 0
-5r + r2 = 0

Solving
-5r + r2 = 0

Solving for variable 'r'.

Factor out the Greatest Common Factor (GCF), 'r'.
r(-5 + r) = 0


Subproblem 1
Set the factor 'r' equal to zero and attempt to solve:

Simplifying
r = 0

Solving
r = 0

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

Simplifying
r = 0

Subproblem 2
Set the factor '(-5 + r)' equal to zero and attempt to solve:

Simplifying
-5 + r = 0

Solving
-5 + r = 0

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

Add '5' to each side of the equation.
-5 + 5 + r = 0 + 5

Combine like terms: -5 + 5 = 0
0 + r = 0 + 5
r = 0 + 5

Combine like terms: 0 + 5 = 5
r = 5

Simplifying
r = 5
Solution
r = {0, 5}

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