7r^2+61r=18

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Solution for 7r^2+61r=18 equation:


Simplifying
7r2 + 61r = 18

Reorder the terms:
61r + 7r2 = 18

Solving
61r + 7r2 = 18

Solving for variable 'r'.

Reorder the terms:
-18 + 61r + 7r2 = 18 + -18

Combine like terms: 18 + -18 = 0
-18 + 61r + 7r2 = 0

Factor a trinomial.
(-9 + -1r)(2 + -7r) = 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 '(2 + -7r)' equal to zero and attempt to solve: Simplifying 2 + -7r = 0 Solving 2 + -7r = 0 Move all terms containing r to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + -7r = 0 + -2 Combine like terms: 2 + -2 = 0 0 + -7r = 0 + -2 -7r = 0 + -2 Combine like terms: 0 + -2 = -2 -7r = -2 Divide each side by '-7'. r = 0.2857142857 Simplifying r = 0.2857142857

Solution

r = {-9, 0.2857142857}

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