2x^3+x^2-8x-2=-2

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


Simplifying
2x3 + x2 + -8x + -2 = -2

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

Add '2' to each side of the equation.
-2 + -8x + x2 + 2 + 2x3 = -2 + 2

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

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

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

Solving
-8x + x2 + 2x3 = 0

Solving for variable 'x'.

Factor out the Greatest Common Factor (GCF), 'x'.
x(-8 + x + 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 '(-8 + x + 2x2)' equal to zero and attempt to solve: Simplifying -8 + x + 2x2 = 0 Solving -8 + x + 2x2 = 0 Begin completing the square. Divide all terms by 2 the coefficient of the squared term: Divide each side by '2'. -4 + 0.5x + x2 = 0 Move the constant term to the right: Add '4' to each side of the equation. -4 + 0.5x + 4 + x2 = 0 + 4 Reorder the terms: -4 + 4 + 0.5x + x2 = 0 + 4 Combine like terms: -4 + 4 = 0 0 + 0.5x + x2 = 0 + 4 0.5x + x2 = 0 + 4 Combine like terms: 0 + 4 = 4 0.5x + x2 = 4 The x term is x. Take half its coefficient (0.5). Square it (0.25) and add it to both sides. Add '0.25' to each side of the equation. 0.5x + 0.25 + x2 = 4 + 0.25 Reorder the terms: 0.25 + 0.5x + x2 = 4 + 0.25 Combine like terms: 4 + 0.25 = 4.25 0.25 + 0.5x + x2 = 4.25 Factor a perfect square on the left side: (x + 0.5)(x + 0.5) = 4.25 Calculate the square root of the right side: 2.061552813 Break this problem into two subproblems by setting (x + 0.5) equal to 2.061552813 and -2.061552813.

Subproblem 1

x + 0.5 = 2.061552813 Simplifying x + 0.5 = 2.061552813 Reorder the terms: 0.5 + x = 2.061552813 Solving 0.5 + x = 2.061552813 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = 2.061552813 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = 2.061552813 + -0.5 x = 2.061552813 + -0.5 Combine like terms: 2.061552813 + -0.5 = 1.561552813 x = 1.561552813 Simplifying x = 1.561552813

Subproblem 2

x + 0.5 = -2.061552813 Simplifying x + 0.5 = -2.061552813 Reorder the terms: 0.5 + x = -2.061552813 Solving 0.5 + x = -2.061552813 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = -2.061552813 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = -2.061552813 + -0.5 x = -2.061552813 + -0.5 Combine like terms: -2.061552813 + -0.5 = -2.561552813 x = -2.561552813 Simplifying x = -2.561552813

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.561552813, -2.561552813}

Solution

x = {0, 1.561552813, -2.561552813}

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