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Simplifying -2(x2) + 16x + -31 = 0 Reorder the terms: -31 + 16x + -2x2 = 0 Solving -31 + 16x + -2x2 = 0 Solving for variable 'x'. Begin completing the square. Divide all terms by -2 the coefficient of the squared term: Divide each side by '-2'. 15.5 + -8x + x2 = 0 Move the constant term to the right: Add '-15.5' to each side of the equation. 15.5 + -8x + -15.5 + x2 = 0 + -15.5 Reorder the terms: 15.5 + -15.5 + -8x + x2 = 0 + -15.5 Combine like terms: 15.5 + -15.5 = 0.0 0.0 + -8x + x2 = 0 + -15.5 -8x + x2 = 0 + -15.5 Combine like terms: 0 + -15.5 = -15.5 -8x + x2 = -15.5 The x term is -8x. Take half its coefficient (-4). Square it (16) and add it to both sides. Add '16' to each side of the equation. -8x + 16 + x2 = -15.5 + 16 Reorder the terms: 16 + -8x + x2 = -15.5 + 16 Combine like terms: -15.5 + 16 = 0.5 16 + -8x + x2 = 0.5 Factor a perfect square on the left side: (x + -4)(x + -4) = 0.5 Calculate the square root of the right side: 0.707106781 Break this problem into two subproblems by setting (x + -4) equal to 0.707106781 and -0.707106781.Subproblem 1
x + -4 = 0.707106781 Simplifying x + -4 = 0.707106781 Reorder the terms: -4 + x = 0.707106781 Solving -4 + x = 0.707106781 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + x = 0.707106781 + 4 Combine like terms: -4 + 4 = 0 0 + x = 0.707106781 + 4 x = 0.707106781 + 4 Combine like terms: 0.707106781 + 4 = 4.707106781 x = 4.707106781 Simplifying x = 4.707106781Subproblem 2
x + -4 = -0.707106781 Simplifying x + -4 = -0.707106781 Reorder the terms: -4 + x = -0.707106781 Solving -4 + x = -0.707106781 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + x = -0.707106781 + 4 Combine like terms: -4 + 4 = 0 0 + x = -0.707106781 + 4 x = -0.707106781 + 4 Combine like terms: -0.707106781 + 4 = 3.292893219 x = 3.292893219 Simplifying x = 3.292893219Solution
The solution to the problem is based on the solutions from the subproblems. x = {4.707106781, 3.292893219}
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