2x^3-4x^2=15x

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Solution for 2x^3-4x^2=15x equation:


Simplifying
2x3 + -4x2 = 15x

Reorder the terms:
-4x2 + 2x3 = 15x

Solving
-4x2 + 2x3 = 15x

Solving for variable 'x'.

Reorder the terms:
-15x + -4x2 + 2x3 = 15x + -15x

Combine like terms: 15x + -15x = 0
-15x + -4x2 + 2x3 = 0

Factor out the Greatest Common Factor (GCF), 'x'.
x(-15 + -4x + 2x2) = 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 '(-15 + -4x + 2x2)' equal to zero and attempt to solve: Simplifying -15 + -4x + 2x2 = 0 Solving -15 + -4x + 2x2 = 0 Begin completing the square. Divide all terms by 2 the coefficient of the squared term: Divide each side by '2'. -7.5 + -2x + x2 = 0 Move the constant term to the right: Add '7.5' to each side of the equation. -7.5 + -2x + 7.5 + x2 = 0 + 7.5 Reorder the terms: -7.5 + 7.5 + -2x + x2 = 0 + 7.5 Combine like terms: -7.5 + 7.5 = 0.0 0.0 + -2x + x2 = 0 + 7.5 -2x + x2 = 0 + 7.5 Combine like terms: 0 + 7.5 = 7.5 -2x + x2 = 7.5 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 = 7.5 + 1 Reorder the terms: 1 + -2x + x2 = 7.5 + 1 Combine like terms: 7.5 + 1 = 8.5 1 + -2x + x2 = 8.5 Factor a perfect square on the left side: (x + -1)(x + -1) = 8.5 Calculate the square root of the right side: 2.915475947 Break this problem into two subproblems by setting (x + -1) equal to 2.915475947 and -2.915475947.

Subproblem 1

x + -1 = 2.915475947 Simplifying x + -1 = 2.915475947 Reorder the terms: -1 + x = 2.915475947 Solving -1 + x = 2.915475947 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 = 2.915475947 + 1 Combine like terms: -1 + 1 = 0 0 + x = 2.915475947 + 1 x = 2.915475947 + 1 Combine like terms: 2.915475947 + 1 = 3.915475947 x = 3.915475947 Simplifying x = 3.915475947

Subproblem 2

x + -1 = -2.915475947 Simplifying x + -1 = -2.915475947 Reorder the terms: -1 + x = -2.915475947 Solving -1 + x = -2.915475947 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 = -2.915475947 + 1 Combine like terms: -1 + 1 = 0 0 + x = -2.915475947 + 1 x = -2.915475947 + 1 Combine like terms: -2.915475947 + 1 = -1.915475947 x = -1.915475947 Simplifying x = -1.915475947

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.915475947, -1.915475947}

Solution

x = {0, 3.915475947, -1.915475947}

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