3r^3-6r^2=105r

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Solution for 3r^3-6r^2=105r equation:


Simplifying
3r3 + -6r2 = 105r

Reorder the terms:
-6r2 + 3r3 = 105r

Solving
-6r2 + 3r3 = 105r

Solving for variable 'r'.

Reorder the terms:
-105r + -6r2 + 3r3 = 105r + -105r

Combine like terms: 105r + -105r = 0
-105r + -6r2 + 3r3 = 0

Factor out the Greatest Common Factor (GCF), '3r'.
3r(-35 + -2r + r2) = 0

Factor a trinomial.
3r((-5 + -1r)(7 + -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 '(-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

Subproblem 3

Set the factor '(7 + -1r)' equal to zero and attempt to solve: Simplifying 7 + -1r = 0 Solving 7 + -1r = 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 + -1r = 0 + -7 Combine like terms: 7 + -7 = 0 0 + -1r = 0 + -7 -1r = 0 + -7 Combine like terms: 0 + -7 = -7 -1r = -7 Divide each side by '-1'. r = 7 Simplifying r = 7

Solution

r = {0, -5, 7}

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