r^2-56=-r

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Solution for r^2-56=-r equation:


Simplifying
r2 + -56 = -1r

Reorder the terms:
-56 + r2 = -1r

Solving
-56 + r2 = -1r

Solving for variable 'r'.

Reorder the terms:
-56 + r + r2 = -1r + r

Combine like terms: -1r + r = 0
-56 + r + r2 = 0

Factor a trinomial.
(-8 + -1r)(7 + -1r) = 0

Subproblem 1

Set the factor '(-8 + -1r)' equal to zero and attempt to solve: Simplifying -8 + -1r = 0 Solving -8 + -1r = 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 + -1r = 0 + 8 Combine like terms: -8 + 8 = 0 0 + -1r = 0 + 8 -1r = 0 + 8 Combine like terms: 0 + 8 = 8 -1r = 8 Divide each side by '-1'. r = -8 Simplifying r = -8

Subproblem 2

Set the factor '(7 + -1r)' equal to zero and attempt to solve: Simplifying 7 + -1r = 0 Solving 7 + -1r = 0 Move all terms containing r to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + -1r = 0 + -7 Combine like terms: 7 + -7 = 0 0 + -1r = 0 + -7 -1r = 0 + -7 Combine like terms: 0 + -7 = -7 -1r = -7 Divide each side by '-1'. r = 7 Simplifying r = 7

Solution

r = {-8, 7}

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