30x^3=21x^2+135x

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Solution for 30x^3=21x^2+135x equation:


Simplifying
30x3 = 21x2 + 135x

Reorder the terms:
30x3 = 135x + 21x2

Solving
30x3 = 135x + 21x2

Solving for variable 'x'.

Reorder the terms:
-135x + -21x2 + 30x3 = 135x + 21x2 + -135x + -21x2

Reorder the terms:
-135x + -21x2 + 30x3 = 135x + -135x + 21x2 + -21x2

Combine like terms: 135x + -135x = 0
-135x + -21x2 + 30x3 = 0 + 21x2 + -21x2
-135x + -21x2 + 30x3 = 21x2 + -21x2

Combine like terms: 21x2 + -21x2 = 0
-135x + -21x2 + 30x3 = 0

Factor out the Greatest Common Factor (GCF), '3x'.
3x(-45 + -7x + 10x2) = 0

Factor a trinomial.
3x((-9 + -5x)(5 + -2x)) = 0

Ignore the factor 3.

Subproblem 1

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

Subproblem 2

Set the factor '(-9 + -5x)' equal to zero and attempt to solve: Simplifying -9 + -5x = 0 Solving -9 + -5x = 0 Move all terms containing x to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + -5x = 0 + 9 Combine like terms: -9 + 9 = 0 0 + -5x = 0 + 9 -5x = 0 + 9 Combine like terms: 0 + 9 = 9 -5x = 9 Divide each side by '-5'. x = -1.8 Simplifying x = -1.8

Subproblem 3

Set the factor '(5 + -2x)' equal to zero and attempt to solve: Simplifying 5 + -2x = 0 Solving 5 + -2x = 0 Move all terms containing x to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + -2x = 0 + -5 Combine like terms: 5 + -5 = 0 0 + -2x = 0 + -5 -2x = 0 + -5 Combine like terms: 0 + -5 = -5 -2x = -5 Divide each side by '-2'. x = 2.5 Simplifying x = 2.5

Solution

x = {0, -1.8, 2.5}

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