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Simplifying 0 = 8x2 + -7x + -5 Reorder the terms: 0 = -5 + -7x + 8x2 Solving 0 = -5 + -7x + 8x2 Solving for variable 'x'. Combine like terms: 0 + 5 = 5 5 + 7x + -8x2 = -5 + -7x + 8x2 + 5 + 7x + -8x2 Reorder the terms: 5 + 7x + -8x2 = -5 + 5 + -7x + 7x + 8x2 + -8x2 Combine like terms: -5 + 5 = 0 5 + 7x + -8x2 = 0 + -7x + 7x + 8x2 + -8x2 5 + 7x + -8x2 = -7x + 7x + 8x2 + -8x2 Combine like terms: -7x + 7x = 0 5 + 7x + -8x2 = 0 + 8x2 + -8x2 5 + 7x + -8x2 = 8x2 + -8x2 Combine like terms: 8x2 + -8x2 = 0 5 + 7x + -8x2 = 0 Begin completing the square. Divide all terms by -8 the coefficient of the squared term: Divide each side by '-8'. -0.625 + -0.875x + x2 = 0 Move the constant term to the right: Add '0.625' to each side of the equation. -0.625 + -0.875x + 0.625 + x2 = 0 + 0.625 Reorder the terms: -0.625 + 0.625 + -0.875x + x2 = 0 + 0.625 Combine like terms: -0.625 + 0.625 = 0.000 0.000 + -0.875x + x2 = 0 + 0.625 -0.875x + x2 = 0 + 0.625 Combine like terms: 0 + 0.625 = 0.625 -0.875x + x2 = 0.625 The x term is -0.875x. Take half its coefficient (-0.4375). Square it (0.19140625) and add it to both sides. Add '0.19140625' to each side of the equation. -0.875x + 0.19140625 + x2 = 0.625 + 0.19140625 Reorder the terms: 0.19140625 + -0.875x + x2 = 0.625 + 0.19140625 Combine like terms: 0.625 + 0.19140625 = 0.81640625 0.19140625 + -0.875x + x2 = 0.81640625 Factor a perfect square on the left side: (x + -0.4375)(x + -0.4375) = 0.81640625 Calculate the square root of the right side: 0.903552018 Break this problem into two subproblems by setting (x + -0.4375) equal to 0.903552018 and -0.903552018.Subproblem 1
x + -0.4375 = 0.903552018 Simplifying x + -0.4375 = 0.903552018 Reorder the terms: -0.4375 + x = 0.903552018 Solving -0.4375 + x = 0.903552018 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.4375' to each side of the equation. -0.4375 + 0.4375 + x = 0.903552018 + 0.4375 Combine like terms: -0.4375 + 0.4375 = 0.0000 0.0000 + x = 0.903552018 + 0.4375 x = 0.903552018 + 0.4375 Combine like terms: 0.903552018 + 0.4375 = 1.341052018 x = 1.341052018 Simplifying x = 1.341052018Subproblem 2
x + -0.4375 = -0.903552018 Simplifying x + -0.4375 = -0.903552018 Reorder the terms: -0.4375 + x = -0.903552018 Solving -0.4375 + x = -0.903552018 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.4375' to each side of the equation. -0.4375 + 0.4375 + x = -0.903552018 + 0.4375 Combine like terms: -0.4375 + 0.4375 = 0.0000 0.0000 + x = -0.903552018 + 0.4375 x = -0.903552018 + 0.4375 Combine like terms: -0.903552018 + 0.4375 = -0.466052018 x = -0.466052018 Simplifying x = -0.466052018Solution
The solution to the problem is based on the solutions from the subproblems. x = {1.341052018, -0.466052018}
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