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Simplifying 0 = -8x2 + 13x + 4 Reorder the terms: 0 = 4 + 13x + -8x2 Solving 0 = 4 + 13x + -8x2 Solving for variable 'x'. Combine like terms: 0 + -4 = -4 -4 + -13x + 8x2 = 4 + 13x + -8x2 + -4 + -13x + 8x2 Reorder the terms: -4 + -13x + 8x2 = 4 + -4 + 13x + -13x + -8x2 + 8x2 Combine like terms: 4 + -4 = 0 -4 + -13x + 8x2 = 0 + 13x + -13x + -8x2 + 8x2 -4 + -13x + 8x2 = 13x + -13x + -8x2 + 8x2 Combine like terms: 13x + -13x = 0 -4 + -13x + 8x2 = 0 + -8x2 + 8x2 -4 + -13x + 8x2 = -8x2 + 8x2 Combine like terms: -8x2 + 8x2 = 0 -4 + -13x + 8x2 = 0 Begin completing the square. Divide all terms by 8 the coefficient of the squared term: Divide each side by '8'. -0.5 + -1.625x + x2 = 0 Move the constant term to the right: Add '0.5' to each side of the equation. -0.5 + -1.625x + 0.5 + x2 = 0 + 0.5 Reorder the terms: -0.5 + 0.5 + -1.625x + x2 = 0 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + -1.625x + x2 = 0 + 0.5 -1.625x + x2 = 0 + 0.5 Combine like terms: 0 + 0.5 = 0.5 -1.625x + x2 = 0.5 The x term is -1.625x. Take half its coefficient (-0.8125). Square it (0.66015625) and add it to both sides. Add '0.66015625' to each side of the equation. -1.625x + 0.66015625 + x2 = 0.5 + 0.66015625 Reorder the terms: 0.66015625 + -1.625x + x2 = 0.5 + 0.66015625 Combine like terms: 0.5 + 0.66015625 = 1.16015625 0.66015625 + -1.625x + x2 = 1.16015625 Factor a perfect square on the left side: (x + -0.8125)(x + -0.8125) = 1.16015625 Calculate the square root of the right side: 1.077105496 Break this problem into two subproblems by setting (x + -0.8125) equal to 1.077105496 and -1.077105496.Subproblem 1
x + -0.8125 = 1.077105496 Simplifying x + -0.8125 = 1.077105496 Reorder the terms: -0.8125 + x = 1.077105496 Solving -0.8125 + x = 1.077105496 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.8125' to each side of the equation. -0.8125 + 0.8125 + x = 1.077105496 + 0.8125 Combine like terms: -0.8125 + 0.8125 = 0.0000 0.0000 + x = 1.077105496 + 0.8125 x = 1.077105496 + 0.8125 Combine like terms: 1.077105496 + 0.8125 = 1.889605496 x = 1.889605496 Simplifying x = 1.889605496Subproblem 2
x + -0.8125 = -1.077105496 Simplifying x + -0.8125 = -1.077105496 Reorder the terms: -0.8125 + x = -1.077105496 Solving -0.8125 + x = -1.077105496 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.8125' to each side of the equation. -0.8125 + 0.8125 + x = -1.077105496 + 0.8125 Combine like terms: -0.8125 + 0.8125 = 0.0000 0.0000 + x = -1.077105496 + 0.8125 x = -1.077105496 + 0.8125 Combine like terms: -1.077105496 + 0.8125 = -0.264605496 x = -0.264605496 Simplifying x = -0.264605496Solution
The solution to the problem is based on the solutions from the subproblems. x = {1.889605496, -0.264605496}
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