3r^3+9r^2=120r

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Solution for 3r^3+9r^2=120r equation:


Simplifying
3r3 + 9r2 = 120r

Reorder the terms:
9r2 + 3r3 = 120r

Solving
9r2 + 3r3 = 120r

Solving for variable 'r'.

Reorder the terms:
-120r + 9r2 + 3r3 = 120r + -120r

Combine like terms: 120r + -120r = 0
-120r + 9r2 + 3r3 = 0

Factor out the Greatest Common Factor (GCF), '3r'.
3r(-40 + 3r + r2) = 0

Factor a trinomial.
3r((-8 + -1r)(5 + -1r)) = 0

Ignore the factor 3.

Subproblem 1

Set the factor 'r' equal to zero and attempt to solve: Simplifying r = 0 Solving r = 0 Move all terms containing r to the left, all other terms to the right. Simplifying r = 0

Subproblem 2

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 3

Set the factor '(5 + -1r)' equal to zero and attempt to solve: Simplifying 5 + -1r = 0 Solving 5 + -1r = 0 Move all terms containing r to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + -1r = 0 + -5 Combine like terms: 5 + -5 = 0 0 + -1r = 0 + -5 -1r = 0 + -5 Combine like terms: 0 + -5 = -5 -1r = -5 Divide each side by '-1'. r = 5 Simplifying r = 5

Solution

r = {0, -8, 5}

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