5r^3+40r^2=45r

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Solution for 5r^3+40r^2=45r equation:


Simplifying
5r3 + 40r2 = 45r

Reorder the terms:
40r2 + 5r3 = 45r

Solving
40r2 + 5r3 = 45r

Solving for variable 'r'.

Reorder the terms:
-45r + 40r2 + 5r3 = 45r + -45r

Combine like terms: 45r + -45r = 0
-45r + 40r2 + 5r3 = 0

Factor out the Greatest Common Factor (GCF), '5r'.
5r(-9 + 8r + r2) = 0

Factor a trinomial.
5r((-9 + -1r)(1 + -1r)) = 0

Ignore the factor 5.

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 '(-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 3

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

Solution

r = {0, -9, 1}

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