0=x^3-7x^2-18x

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Solution for 0=x^3-7x^2-18x equation:


Simplifying
0 = x3 + -7x2 + -18x

Reorder the terms:
0 = -18x + -7x2 + x3

Solving
0 = -18x + -7x2 + x3

Solving for variable 'x'.
Remove the zero:
18x + 7x2 + -1x3 = -18x + -7x2 + x3 + 18x + 7x2 + -1x3

Reorder the terms:
18x + 7x2 + -1x3 = -18x + 18x + -7x2 + 7x2 + x3 + -1x3

Combine like terms: -18x + 18x = 0
18x + 7x2 + -1x3 = 0 + -7x2 + 7x2 + x3 + -1x3
18x + 7x2 + -1x3 = -7x2 + 7x2 + x3 + -1x3

Combine like terms: -7x2 + 7x2 = 0
18x + 7x2 + -1x3 = 0 + x3 + -1x3
18x + 7x2 + -1x3 = x3 + -1x3

Combine like terms: x3 + -1x3 = 0
18x + 7x2 + -1x3 = 0

Factor out the Greatest Common Factor (GCF), 'x'.
x(18 + 7x + -1x2) = 0

Factor a trinomial.
x((9 + -1x)(2 + x)) = 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 '(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

Subproblem 3

Set the factor '(2 + x)' equal to zero and attempt to solve: Simplifying 2 + x = 0 Solving 2 + x = 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 + x = 0 + -2 Combine like terms: 2 + -2 = 0 0 + x = 0 + -2 x = 0 + -2 Combine like terms: 0 + -2 = -2 x = -2 Simplifying x = -2

Solution

x = {0, 9, -2}

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