3x^3-21x^2=54x

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Solution for 3x^3-21x^2=54x equation:


Simplifying
3x3 + -21x2 = 54x

Reorder the terms:
-21x2 + 3x3 = 54x

Solving
-21x2 + 3x3 = 54x

Solving for variable 'x'.

Reorder the terms:
-54x + -21x2 + 3x3 = 54x + -54x

Combine like terms: 54x + -54x = 0
-54x + -21x2 + 3x3 = 0

Factor out the Greatest Common Factor (GCF), '3x'.
3x(-18 + -7x + x2) = 0

Factor a trinomial.
3x((-2 + -1x)(9 + -1x)) = 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 '(-2 + -1x)' equal to zero and attempt to solve: Simplifying -2 + -1x = 0 Solving -2 + -1x = 0 Move all terms containing x to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + -1x = 0 + 2 Combine like terms: -2 + 2 = 0 0 + -1x = 0 + 2 -1x = 0 + 2 Combine like terms: 0 + 2 = 2 -1x = 2 Divide each side by '-1'. x = -2 Simplifying x = -2

Subproblem 3

Set the factor '(9 + -1x)' equal to zero and attempt to solve: Simplifying 9 + -1x = 0 Solving 9 + -1x = 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 + -1x = 0 + -9 Combine like terms: 9 + -9 = 0 0 + -1x = 0 + -9 -1x = 0 + -9 Combine like terms: 0 + -9 = -9 -1x = -9 Divide each side by '-1'. x = 9 Simplifying x = 9

Solution

x = {0, -2, 9}

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