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Simplifying (12x^{2}+ -3x + -8) + -1(4x^{2}+ 5) = 0 Reorder the terms: (-8 + -3x + 12x^{2}) + -1(4x^{2}+ 5) = 0 Remove parenthesis around (-8 + -3x + 12x^{2}) -8 + -3x + 12x^{2}+ -1(4x^{2}+ 5) = 0 Reorder the terms: -8 + -3x + 12x^{2}+ -1(5 + 4x^{2}) = 0 -8 + -3x + 12x^{2}+ (5 * -1 + 4x^{2}* -1) = 0 -8 + -3x + 12x^{2}+ (-5 + -4x^{2}) = 0 Reorder the terms: -8 + -5 + -3x + 12x^{2}+ -4x^{2}= 0 Combine like terms: -8 + -5 = -13 -13 + -3x + 12x^{2}+ -4x^{2}= 0 Combine like terms: 12x^{2}+ -4x^{2}= 8x^{2}-13 + -3x + 8x^{2}= 0 Solving -13 + -3x + 8x^{2}= 0 Solving for variable 'x'. Begin completing the square. Divide all terms by 8 the coefficient of the squared term: Divide each side by '8'. -1.625 + -0.375x + x^{2}= 0 Move the constant term to the right: Add '1.625' to each side of the equation. -1.625 + -0.375x + 1.625 + x^{2}= 0 + 1.625 Reorder the terms: -1.625 + 1.625 + -0.375x + x^{2}= 0 + 1.625 Combine like terms: -1.625 + 1.625 = 0.000 0.000 + -0.375x + x^{2}= 0 + 1.625 -0.375x + x^{2}= 0 + 1.625 Combine like terms: 0 + 1.625 = 1.625 -0.375x + x^{2}= 1.625 The x term is -0.375x. Take half its coefficient (-0.1875). Square it (0.03515625) and add it to both sides. Add '0.03515625' to each side of the equation. -0.375x + 0.03515625 + x^{2}= 1.625 + 0.03515625 Reorder the terms: 0.03515625 + -0.375x + x^{2}= 1.625 + 0.03515625 Combine like terms: 1.625 + 0.03515625 = 1.66015625 0.03515625 + -0.375x + x^{2}= 1.66015625 Factor a perfect square on the left side: (x + -0.1875)(x + -0.1875) = 1.66015625 Calculate the square root of the right side: 1.288470508 Break this problem into two subproblems by setting (x + -0.1875) equal to 1.288470508 and -1.288470508.## Subproblem 1

x + -0.1875 = 1.288470508 Simplifying x + -0.1875 = 1.288470508 Reorder the terms: -0.1875 + x = 1.288470508 Solving -0.1875 + x = 1.288470508 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.1875' to each side of the equation. -0.1875 + 0.1875 + x = 1.288470508 + 0.1875 Combine like terms: -0.1875 + 0.1875 = 0.0000 0.0000 + x = 1.288470508 + 0.1875 x = 1.288470508 + 0.1875 Combine like terms: 1.288470508 + 0.1875 = 1.475970508 x = 1.475970508 Simplifying x = 1.475970508## Subproblem 2

x + -0.1875 = -1.288470508 Simplifying x + -0.1875 = -1.288470508 Reorder the terms: -0.1875 + x = -1.288470508 Solving -0.1875 + x = -1.288470508 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.1875' to each side of the equation. -0.1875 + 0.1875 + x = -1.288470508 + 0.1875 Combine like terms: -0.1875 + 0.1875 = 0.0000 0.0000 + x = -1.288470508 + 0.1875 x = -1.288470508 + 0.1875 Combine like terms: -1.288470508 + 0.1875 = -1.100970508 x = -1.100970508 Simplifying x = -1.100970508## Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.475970508, -1.100970508}

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