27r^2+129r+84=0

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Solution for 27r^2+129r+84=0 equation:


Simplifying
27r2 + 129r + 84 = 0

Reorder the terms:
84 + 129r + 27r2 = 0

Solving
84 + 129r + 27r2 = 0

Solving for variable 'r'.

Factor out the Greatest Common Factor (GCF), '3'.
3(28 + 43r + 9r2) = 0

Factor a trinomial.
3((4 + r)(7 + 9r)) = 0

Ignore the factor 3.

Subproblem 1

Set the factor '(4 + r)' equal to zero and attempt to solve: Simplifying 4 + r = 0 Solving 4 + r = 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 + r = 0 + -4 Combine like terms: 4 + -4 = 0 0 + r = 0 + -4 r = 0 + -4 Combine like terms: 0 + -4 = -4 r = -4 Simplifying r = -4

Subproblem 2

Set the factor '(7 + 9r)' equal to zero and attempt to solve: Simplifying 7 + 9r = 0 Solving 7 + 9r = 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 + 9r = 0 + -7 Combine like terms: 7 + -7 = 0 0 + 9r = 0 + -7 9r = 0 + -7 Combine like terms: 0 + -7 = -7 9r = -7 Divide each side by '9'. r = -0.7777777778 Simplifying r = -0.7777777778

Solution

r = {-4, -0.7777777778}

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