2x^3-20x^2=18x

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Solution for 2x^3-20x^2=18x equation:


Simplifying
2x3 + -20x2 = 18x

Reorder the terms:
-20x2 + 2x3 = 18x

Solving
-20x2 + 2x3 = 18x

Solving for variable 'x'.

Reorder the terms:
-18x + -20x2 + 2x3 = 18x + -18x

Combine like terms: 18x + -18x = 0
-18x + -20x2 + 2x3 = 0

Factor out the Greatest Common Factor (GCF), '2x'.
2x(-9 + -10x + x2) = 0

Ignore the factor 2.

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 + -10x + x2)' equal to zero and attempt to solve: Simplifying -9 + -10x + x2 = 0 Solving -9 + -10x + x2 = 0 Begin completing the square. Move the constant term to the right: Add '9' to each side of the equation. -9 + -10x + 9 + x2 = 0 + 9 Reorder the terms: -9 + 9 + -10x + x2 = 0 + 9 Combine like terms: -9 + 9 = 0 0 + -10x + x2 = 0 + 9 -10x + x2 = 0 + 9 Combine like terms: 0 + 9 = 9 -10x + x2 = 9 The x term is -10x. Take half its coefficient (-5). Square it (25) and add it to both sides. Add '25' to each side of the equation. -10x + 25 + x2 = 9 + 25 Reorder the terms: 25 + -10x + x2 = 9 + 25 Combine like terms: 9 + 25 = 34 25 + -10x + x2 = 34 Factor a perfect square on the left side: (x + -5)(x + -5) = 34 Calculate the square root of the right side: 5.830951895 Break this problem into two subproblems by setting (x + -5) equal to 5.830951895 and -5.830951895.

Subproblem 1

x + -5 = 5.830951895 Simplifying x + -5 = 5.830951895 Reorder the terms: -5 + x = 5.830951895 Solving -5 + x = 5.830951895 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + x = 5.830951895 + 5 Combine like terms: -5 + 5 = 0 0 + x = 5.830951895 + 5 x = 5.830951895 + 5 Combine like terms: 5.830951895 + 5 = 10.830951895 x = 10.830951895 Simplifying x = 10.830951895

Subproblem 2

x + -5 = -5.830951895 Simplifying x + -5 = -5.830951895 Reorder the terms: -5 + x = -5.830951895 Solving -5 + x = -5.830951895 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + x = -5.830951895 + 5 Combine like terms: -5 + 5 = 0 0 + x = -5.830951895 + 5 x = -5.830951895 + 5 Combine like terms: -5.830951895 + 5 = -0.830951895 x = -0.830951895 Simplifying x = -0.830951895

Solution

The solution to the problem is based on the solutions from the subproblems. x = {10.830951895, -0.830951895}

Solution

x = {0, 10.830951895, -0.830951895}

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