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Simplifying -8x2 + 5x + 7 = 0 Reorder the terms: 7 + 5x + -8x2 = 0 Solving 7 + 5x + -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'. -0.875 + -0.625x + x2 = 0 Move the constant term to the right: Add '0.875' to each side of the equation. -0.875 + -0.625x + 0.875 + x2 = 0 + 0.875 Reorder the terms: -0.875 + 0.875 + -0.625x + x2 = 0 + 0.875 Combine like terms: -0.875 + 0.875 = 0.000 0.000 + -0.625x + x2 = 0 + 0.875 -0.625x + x2 = 0 + 0.875 Combine like terms: 0 + 0.875 = 0.875 -0.625x + x2 = 0.875 The x term is -0.625x. Take half its coefficient (-0.3125). Square it (0.09765625) and add it to both sides. Add '0.09765625' to each side of the equation. -0.625x + 0.09765625 + x2 = 0.875 + 0.09765625 Reorder the terms: 0.09765625 + -0.625x + x2 = 0.875 + 0.09765625 Combine like terms: 0.875 + 0.09765625 = 0.97265625 0.09765625 + -0.625x + x2 = 0.97265625 Factor a perfect square on the left side: (x + -0.3125)(x + -0.3125) = 0.97265625 Calculate the square root of the right side: 0.986233365 Break this problem into two subproblems by setting (x + -0.3125) equal to 0.986233365 and -0.986233365.Subproblem 1
x + -0.3125 = 0.986233365 Simplifying x + -0.3125 = 0.986233365 Reorder the terms: -0.3125 + x = 0.986233365 Solving -0.3125 + x = 0.986233365 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.3125' to each side of the equation. -0.3125 + 0.3125 + x = 0.986233365 + 0.3125 Combine like terms: -0.3125 + 0.3125 = 0.0000 0.0000 + x = 0.986233365 + 0.3125 x = 0.986233365 + 0.3125 Combine like terms: 0.986233365 + 0.3125 = 1.298733365 x = 1.298733365 Simplifying x = 1.298733365Subproblem 2
x + -0.3125 = -0.986233365 Simplifying x + -0.3125 = -0.986233365 Reorder the terms: -0.3125 + x = -0.986233365 Solving -0.3125 + x = -0.986233365 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.3125' to each side of the equation. -0.3125 + 0.3125 + x = -0.986233365 + 0.3125 Combine like terms: -0.3125 + 0.3125 = 0.0000 0.0000 + x = -0.986233365 + 0.3125 x = -0.986233365 + 0.3125 Combine like terms: -0.986233365 + 0.3125 = -0.673733365 x = -0.673733365 Simplifying x = -0.673733365Solution
The solution to the problem is based on the solutions from the subproblems. x = {1.298733365, -0.673733365}
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