8x^3+20x^2-4x=0

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Solution for 8x^3+20x^2-4x=0 equation:


Simplifying
8x3 + 20x2 + -4x = 0

Reorder the terms:
-4x + 20x2 + 8x3 = 0

Solving
-4x + 20x2 + 8x3 = 0

Solving for variable 'x'.

Factor out the Greatest Common Factor (GCF), '4x'.
4x(-1 + 5x + 2x2) = 0

Ignore the factor 4.

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 '(-1 + 5x + 2x2)' equal to zero and attempt to solve: Simplifying -1 + 5x + 2x2 = 0 Solving -1 + 5x + 2x2 = 0 Begin completing the square. Divide all terms by 2 the coefficient of the squared term: Divide each side by '2'. -0.5 + 2.5x + x2 = 0 Move the constant term to the right: Add '0.5' to each side of the equation. -0.5 + 2.5x + 0.5 + x2 = 0 + 0.5 Reorder the terms: -0.5 + 0.5 + 2.5x + x2 = 0 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + 2.5x + x2 = 0 + 0.5 2.5x + x2 = 0 + 0.5 Combine like terms: 0 + 0.5 = 0.5 2.5x + x2 = 0.5 The x term is 2.5x. Take half its coefficient (1.25). Square it (1.5625) and add it to both sides. Add '1.5625' to each side of the equation. 2.5x + 1.5625 + x2 = 0.5 + 1.5625 Reorder the terms: 1.5625 + 2.5x + x2 = 0.5 + 1.5625 Combine like terms: 0.5 + 1.5625 = 2.0625 1.5625 + 2.5x + x2 = 2.0625 Factor a perfect square on the left side: (x + 1.25)(x + 1.25) = 2.0625 Calculate the square root of the right side: 1.436140662 Break this problem into two subproblems by setting (x + 1.25) equal to 1.436140662 and -1.436140662.

Subproblem 1

x + 1.25 = 1.436140662 Simplifying x + 1.25 = 1.436140662 Reorder the terms: 1.25 + x = 1.436140662 Solving 1.25 + x = 1.436140662 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.25' to each side of the equation. 1.25 + -1.25 + x = 1.436140662 + -1.25 Combine like terms: 1.25 + -1.25 = 0.00 0.00 + x = 1.436140662 + -1.25 x = 1.436140662 + -1.25 Combine like terms: 1.436140662 + -1.25 = 0.186140662 x = 0.186140662 Simplifying x = 0.186140662

Subproblem 2

x + 1.25 = -1.436140662 Simplifying x + 1.25 = -1.436140662 Reorder the terms: 1.25 + x = -1.436140662 Solving 1.25 + x = -1.436140662 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.25' to each side of the equation. 1.25 + -1.25 + x = -1.436140662 + -1.25 Combine like terms: 1.25 + -1.25 = 0.00 0.00 + x = -1.436140662 + -1.25 x = -1.436140662 + -1.25 Combine like terms: -1.436140662 + -1.25 = -2.686140662 x = -2.686140662 Simplifying x = -2.686140662

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.186140662, -2.686140662}

Solution

x = {0, 0.186140662, -2.686140662}

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