2x^3+21x^2=-40x

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Solution for 2x^3+21x^2=-40x equation:


Simplifying
2x3 + 21x2 = -40x

Reorder the terms:
21x2 + 2x3 = -40x

Solving
21x2 + 2x3 = -40x

Solving for variable 'x'.

Reorder the terms:
40x + 21x2 + 2x3 = -40x + 40x

Combine like terms: -40x + 40x = 0
40x + 21x2 + 2x3 = 0

Factor out the Greatest Common Factor (GCF), 'x'.
x(40 + 21x + 2x2) = 0

Factor a trinomial.
x((8 + x)(5 + 2x)) = 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 '(8 + x)' equal to zero and attempt to solve: Simplifying 8 + x = 0 Solving 8 + x = 0 Move all terms containing x to the left, all other terms to the right. Add '-8' to each side of the equation. 8 + -8 + x = 0 + -8 Combine like terms: 8 + -8 = 0 0 + x = 0 + -8 x = 0 + -8 Combine like terms: 0 + -8 = -8 x = -8 Simplifying x = -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, -8, -2.5}

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