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Simplifying -8x2 + 75x + 20 = 0 Reorder the terms: 20 + 75x + -8x2 = 0 Solving 20 + 75x + -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'. -2.5 + -9.375x + x2 = 0 Move the constant term to the right: Add '2.5' to each side of the equation. -2.5 + -9.375x + 2.5 + x2 = 0 + 2.5 Reorder the terms: -2.5 + 2.5 + -9.375x + x2 = 0 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + -9.375x + x2 = 0 + 2.5 -9.375x + x2 = 0 + 2.5 Combine like terms: 0 + 2.5 = 2.5 -9.375x + x2 = 2.5 The x term is -9.375x. Take half its coefficient (-4.6875). Square it (21.97265625) and add it to both sides. Add '21.97265625' to each side of the equation. -9.375x + 21.97265625 + x2 = 2.5 + 21.97265625 Reorder the terms: 21.97265625 + -9.375x + x2 = 2.5 + 21.97265625 Combine like terms: 2.5 + 21.97265625 = 24.47265625 21.97265625 + -9.375x + x2 = 24.47265625 Factor a perfect square on the left side: (x + -4.6875)(x + -4.6875) = 24.47265625 Calculate the square root of the right side: 4.946984561 Break this problem into two subproblems by setting (x + -4.6875) equal to 4.946984561 and -4.946984561.Subproblem 1
x + -4.6875 = 4.946984561 Simplifying x + -4.6875 = 4.946984561 Reorder the terms: -4.6875 + x = 4.946984561 Solving -4.6875 + x = 4.946984561 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4.6875' to each side of the equation. -4.6875 + 4.6875 + x = 4.946984561 + 4.6875 Combine like terms: -4.6875 + 4.6875 = 0.0000 0.0000 + x = 4.946984561 + 4.6875 x = 4.946984561 + 4.6875 Combine like terms: 4.946984561 + 4.6875 = 9.634484561 x = 9.634484561 Simplifying x = 9.634484561Subproblem 2
x + -4.6875 = -4.946984561 Simplifying x + -4.6875 = -4.946984561 Reorder the terms: -4.6875 + x = -4.946984561 Solving -4.6875 + x = -4.946984561 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4.6875' to each side of the equation. -4.6875 + 4.6875 + x = -4.946984561 + 4.6875 Combine like terms: -4.6875 + 4.6875 = 0.0000 0.0000 + x = -4.946984561 + 4.6875 x = -4.946984561 + 4.6875 Combine like terms: -4.946984561 + 4.6875 = -0.259484561 x = -0.259484561 Simplifying x = -0.259484561Solution
The solution to the problem is based on the solutions from the subproblems. x = {9.634484561, -0.259484561}
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