r^2-r=4r+36

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


Simplifying
r2 + -1r = 4r + 36

Reorder the terms:
-1r + r2 = 4r + 36

Reorder the terms:
-1r + r2 = 36 + 4r

Solving
-1r + r2 = 36 + 4r

Solving for variable 'r'.

Reorder the terms:
-36 + -1r + -4r + r2 = 36 + 4r + -36 + -4r

Combine like terms: -1r + -4r = -5r
-36 + -5r + r2 = 36 + 4r + -36 + -4r

Reorder the terms:
-36 + -5r + r2 = 36 + -36 + 4r + -4r

Combine like terms: 36 + -36 = 0
-36 + -5r + r2 = 0 + 4r + -4r
-36 + -5r + r2 = 4r + -4r

Combine like terms: 4r + -4r = 0
-36 + -5r + r2 = 0

Factor a trinomial.
(-4 + -1r)(9 + -1r) = 0

Subproblem 1

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

Subproblem 2

Set the factor '(9 + -1r)' equal to zero and attempt to solve: Simplifying 9 + -1r = 0 Solving 9 + -1r = 0 Move all terms containing r to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + -1r = 0 + -9 Combine like terms: 9 + -9 = 0 0 + -1r = 0 + -9 -1r = 0 + -9 Combine like terms: 0 + -9 = -9 -1r = -9 Divide each side by '-1'. r = 9 Simplifying r = 9

Solution

r = {-4, 9}

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