(x^3)-9x-(2x^2)=8x

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Solution for (x^3)-9x-(2x^2)=8x equation:


Simplifying
(x3) + -9x + -1(2x2) = 8x
x3 + -9x + -1(2x2) = 8x

Remove parenthesis around (2x2)
x3 + -9x + -1 * 2x2 = 8x

Multiply -1 * 2
x3 + -9x + -2x2 = 8x

Reorder the terms:
-9x + -2x2 + x3 = 8x

Solving
-9x + -2x2 + x3 = 8x

Solving for variable 'x'.

Reorder the terms:
-9x + -8x + -2x2 + x3 = 8x + -8x

Combine like terms: -9x + -8x = -17x
-17x + -2x2 + x3 = 8x + -8x

Combine like terms: 8x + -8x = 0
-17x + -2x2 + x3 = 0

Factor out the Greatest Common Factor (GCF), 'x'.
x(-17 + -2x + x2) = 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 '(-17 + -2x + x2)' equal to zero and attempt to solve: Simplifying -17 + -2x + x2 = 0 Solving -17 + -2x + x2 = 0 Begin completing the square. Move the constant term to the right: Add '17' to each side of the equation. -17 + -2x + 17 + x2 = 0 + 17 Reorder the terms: -17 + 17 + -2x + x2 = 0 + 17 Combine like terms: -17 + 17 = 0 0 + -2x + x2 = 0 + 17 -2x + x2 = 0 + 17 Combine like terms: 0 + 17 = 17 -2x + x2 = 17 The x term is -2x. Take half its coefficient (-1). Square it (1) and add it to both sides. Add '1' to each side of the equation. -2x + 1 + x2 = 17 + 1 Reorder the terms: 1 + -2x + x2 = 17 + 1 Combine like terms: 17 + 1 = 18 1 + -2x + x2 = 18 Factor a perfect square on the left side: (x + -1)(x + -1) = 18 Calculate the square root of the right side: 4.242640687 Break this problem into two subproblems by setting (x + -1) equal to 4.242640687 and -4.242640687.

Subproblem 1

x + -1 = 4.242640687 Simplifying x + -1 = 4.242640687 Reorder the terms: -1 + x = 4.242640687 Solving -1 + x = 4.242640687 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + x = 4.242640687 + 1 Combine like terms: -1 + 1 = 0 0 + x = 4.242640687 + 1 x = 4.242640687 + 1 Combine like terms: 4.242640687 + 1 = 5.242640687 x = 5.242640687 Simplifying x = 5.242640687

Subproblem 2

x + -1 = -4.242640687 Simplifying x + -1 = -4.242640687 Reorder the terms: -1 + x = -4.242640687 Solving -1 + x = -4.242640687 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + x = -4.242640687 + 1 Combine like terms: -1 + 1 = 0 0 + x = -4.242640687 + 1 x = -4.242640687 + 1 Combine like terms: -4.242640687 + 1 = -3.242640687 x = -3.242640687 Simplifying x = -3.242640687

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.242640687, -3.242640687}

Solution

x = {0, 5.242640687, -3.242640687}

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