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Simplifying -8x2 + 9x + 5 = 0 Reorder the terms: 5 + 9x + -8x2 = 0 Solving 5 + 9x + -8x2 = 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'. -0.625 + -1.125x + x2 = 0 Move the constant term to the right: Add '0.625' to each side of the equation. -0.625 + -1.125x + 0.625 + x2 = 0 + 0.625 Reorder the terms: -0.625 + 0.625 + -1.125x + x2 = 0 + 0.625 Combine like terms: -0.625 + 0.625 = 0.000 0.000 + -1.125x + x2 = 0 + 0.625 -1.125x + x2 = 0 + 0.625 Combine like terms: 0 + 0.625 = 0.625 -1.125x + x2 = 0.625 The x term is -1.125x. Take half its coefficient (-0.5625). Square it (0.31640625) and add it to both sides. Add '0.31640625' to each side of the equation. -1.125x + 0.31640625 + x2 = 0.625 + 0.31640625 Reorder the terms: 0.31640625 + -1.125x + x2 = 0.625 + 0.31640625 Combine like terms: 0.625 + 0.31640625 = 0.94140625 0.31640625 + -1.125x + x2 = 0.94140625 Factor a perfect square on the left side: (x + -0.5625)(x + -0.5625) = 0.94140625 Calculate the square root of the right side: 0.970260919 Break this problem into two subproblems by setting (x + -0.5625) equal to 0.970260919 and -0.970260919.Subproblem 1
x + -0.5625 = 0.970260919 Simplifying x + -0.5625 = 0.970260919 Reorder the terms: -0.5625 + x = 0.970260919 Solving -0.5625 + x = 0.970260919 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.5625' to each side of the equation. -0.5625 + 0.5625 + x = 0.970260919 + 0.5625 Combine like terms: -0.5625 + 0.5625 = 0.0000 0.0000 + x = 0.970260919 + 0.5625 x = 0.970260919 + 0.5625 Combine like terms: 0.970260919 + 0.5625 = 1.532760919 x = 1.532760919 Simplifying x = 1.532760919Subproblem 2
x + -0.5625 = -0.970260919 Simplifying x + -0.5625 = -0.970260919 Reorder the terms: -0.5625 + x = -0.970260919 Solving -0.5625 + x = -0.970260919 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.5625' to each side of the equation. -0.5625 + 0.5625 + x = -0.970260919 + 0.5625 Combine like terms: -0.5625 + 0.5625 = 0.0000 0.0000 + x = -0.970260919 + 0.5625 x = -0.970260919 + 0.5625 Combine like terms: -0.970260919 + 0.5625 = -0.407760919 x = -0.407760919 Simplifying x = -0.407760919Solution
The solution to the problem is based on the solutions from the subproblems. x = {1.532760919, -0.407760919}
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