8x^2+2x^2-16x-4=0

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Solution for 8x^2+2x^2-16x-4=0 equation:


Simplifying
8x2 + 2x2 + -16x + -4 = 0

Reorder the terms:
-4 + -16x + 8x2 + 2x2 = 0

Combine like terms: 8x2 + 2x2 = 10x2
-4 + -16x + 10x2 = 0

Solving
-4 + -16x + 10x2 = 0

Solving for variable 'x'.

Factor out the Greatest Common Factor (GCF), '2'.
2(-2 + -8x + 5x2) = 0

Ignore the factor 2.

Subproblem 1

Set the factor '(-2 + -8x + 5x2)' equal to zero and attempt to solve: Simplifying -2 + -8x + 5x2 = 0 Solving -2 + -8x + 5x2 = 0 Begin completing the square. Divide all terms by 5 the coefficient of the squared term: Divide each side by '5'. -0.4 + -1.6x + x2 = 0 Move the constant term to the right: Add '0.4' to each side of the equation. -0.4 + -1.6x + 0.4 + x2 = 0 + 0.4 Reorder the terms: -0.4 + 0.4 + -1.6x + x2 = 0 + 0.4 Combine like terms: -0.4 + 0.4 = 0.0 0.0 + -1.6x + x2 = 0 + 0.4 -1.6x + x2 = 0 + 0.4 Combine like terms: 0 + 0.4 = 0.4 -1.6x + x2 = 0.4 The x term is -1.6x. Take half its coefficient (-0.8). Square it (0.64) and add it to both sides. Add '0.64' to each side of the equation. -1.6x + 0.64 + x2 = 0.4 + 0.64 Reorder the terms: 0.64 + -1.6x + x2 = 0.4 + 0.64 Combine like terms: 0.4 + 0.64 = 1.04 0.64 + -1.6x + x2 = 1.04 Factor a perfect square on the left side: (x + -0.8)(x + -0.8) = 1.04 Calculate the square root of the right side: 1.019803903 Break this problem into two subproblems by setting (x + -0.8) equal to 1.019803903 and -1.019803903.

Subproblem 1

x + -0.8 = 1.019803903 Simplifying x + -0.8 = 1.019803903 Reorder the terms: -0.8 + x = 1.019803903 Solving -0.8 + x = 1.019803903 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.8' to each side of the equation. -0.8 + 0.8 + x = 1.019803903 + 0.8 Combine like terms: -0.8 + 0.8 = 0.0 0.0 + x = 1.019803903 + 0.8 x = 1.019803903 + 0.8 Combine like terms: 1.019803903 + 0.8 = 1.819803903 x = 1.819803903 Simplifying x = 1.819803903

Subproblem 2

x + -0.8 = -1.019803903 Simplifying x + -0.8 = -1.019803903 Reorder the terms: -0.8 + x = -1.019803903 Solving -0.8 + x = -1.019803903 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.8' to each side of the equation. -0.8 + 0.8 + x = -1.019803903 + 0.8 Combine like terms: -0.8 + 0.8 = 0.0 0.0 + x = -1.019803903 + 0.8 x = -1.019803903 + 0.8 Combine like terms: -1.019803903 + 0.8 = -0.219803903 x = -0.219803903 Simplifying x = -0.219803903

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.819803903, -0.219803903}

Solution

x = {1.819803903, -0.219803903}

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