r^2+5r=36

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Solution for r^2+5r=36 equation:


Simplifying
r2 + 5r = 36

Reorder the terms:
5r + r2 = 36

Solving
5r + r2 = 36

Solving for variable 'r'.

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

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

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

Subproblem 1

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

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 = {-9, 4}

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