x^3-4x^2=21x

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Solution for x^3-4x^2=21x equation:


Simplifying
x3 + -4x2 = 21x

Reorder the terms:
-4x2 + x3 = 21x

Solving
-4x2 + x3 = 21x

Solving for variable 'x'.

Reorder the terms:
-21x + -4x2 + x3 = 21x + -21x

Combine like terms: 21x + -21x = 0
-21x + -4x2 + x3 = 0

Factor out the Greatest Common Factor (GCF), 'x'.
x(-21 + -4x + x2) = 0

Factor a trinomial.
x((-3 + -1x)(7 + -1x)) = 0

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

Subproblem 3

Set the factor '(7 + -1x)' equal to zero and attempt to solve: Simplifying 7 + -1x = 0 Solving 7 + -1x = 0 Move all terms containing x to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + -1x = 0 + -7 Combine like terms: 7 + -7 = 0 0 + -1x = 0 + -7 -1x = 0 + -7 Combine like terms: 0 + -7 = -7 -1x = -7 Divide each side by '-1'. x = 7 Simplifying x = 7

Solution

x = {0, -3, 7}

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