8x^3-14x^2-18x=0

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Solution for 8x^3-14x^2-18x=0 equation:


Simplifying
8x3 + -14x2 + -18x = 0

Reorder the terms:
-18x + -14x2 + 8x3 = 0

Solving
-18x + -14x2 + 8x3 = 0

Solving for variable 'x'.

Factor out the Greatest Common Factor (GCF), '2x'.
2x(-9 + -7x + 4x2) = 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 + -7x + 4x2)' equal to zero and attempt to solve: Simplifying -9 + -7x + 4x2 = 0 Solving -9 + -7x + 4x2 = 0 Begin completing the square. Divide all terms by 4 the coefficient of the squared term: Divide each side by '4'. -2.25 + -1.75x + x2 = 0 Move the constant term to the right: Add '2.25' to each side of the equation. -2.25 + -1.75x + 2.25 + x2 = 0 + 2.25 Reorder the terms: -2.25 + 2.25 + -1.75x + x2 = 0 + 2.25 Combine like terms: -2.25 + 2.25 = 0.00 0.00 + -1.75x + x2 = 0 + 2.25 -1.75x + x2 = 0 + 2.25 Combine like terms: 0 + 2.25 = 2.25 -1.75x + x2 = 2.25 The x term is -1.75x. Take half its coefficient (-0.875). Square it (0.765625) and add it to both sides. Add '0.765625' to each side of the equation. -1.75x + 0.765625 + x2 = 2.25 + 0.765625 Reorder the terms: 0.765625 + -1.75x + x2 = 2.25 + 0.765625 Combine like terms: 2.25 + 0.765625 = 3.015625 0.765625 + -1.75x + x2 = 3.015625 Factor a perfect square on the left side: (x + -0.875)(x + -0.875) = 3.015625 Calculate the square root of the right side: 1.736555499 Break this problem into two subproblems by setting (x + -0.875) equal to 1.736555499 and -1.736555499.

Subproblem 1

x + -0.875 = 1.736555499 Simplifying x + -0.875 = 1.736555499 Reorder the terms: -0.875 + x = 1.736555499 Solving -0.875 + x = 1.736555499 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.875' to each side of the equation. -0.875 + 0.875 + x = 1.736555499 + 0.875 Combine like terms: -0.875 + 0.875 = 0.000 0.000 + x = 1.736555499 + 0.875 x = 1.736555499 + 0.875 Combine like terms: 1.736555499 + 0.875 = 2.611555499 x = 2.611555499 Simplifying x = 2.611555499

Subproblem 2

x + -0.875 = -1.736555499 Simplifying x + -0.875 = -1.736555499 Reorder the terms: -0.875 + x = -1.736555499 Solving -0.875 + x = -1.736555499 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.875' to each side of the equation. -0.875 + 0.875 + x = -1.736555499 + 0.875 Combine like terms: -0.875 + 0.875 = 0.000 0.000 + x = -1.736555499 + 0.875 x = -1.736555499 + 0.875 Combine like terms: -1.736555499 + 0.875 = -0.861555499 x = -0.861555499 Simplifying x = -0.861555499

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.611555499, -0.861555499}

Solution

x = {0, 2.611555499, -0.861555499}

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