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Simplifying 0 = -16x2 + 80x + 5 Reorder the terms: 0 = 5 + 80x + -16x2 Solving 0 = 5 + 80x + -16x2 Solving for variable 'x'. Combine like terms: 0 + -5 = -5 -5 + -80x + 16x2 = 5 + 80x + -16x2 + -5 + -80x + 16x2 Reorder the terms: -5 + -80x + 16x2 = 5 + -5 + 80x + -80x + -16x2 + 16x2 Combine like terms: 5 + -5 = 0 -5 + -80x + 16x2 = 0 + 80x + -80x + -16x2 + 16x2 -5 + -80x + 16x2 = 80x + -80x + -16x2 + 16x2 Combine like terms: 80x + -80x = 0 -5 + -80x + 16x2 = 0 + -16x2 + 16x2 -5 + -80x + 16x2 = -16x2 + 16x2 Combine like terms: -16x2 + 16x2 = 0 -5 + -80x + 16x2 = 0 Begin completing the square. Divide all terms by 16 the coefficient of the squared term: Divide each side by '16'. -0.3125 + -5x + x2 = 0 Move the constant term to the right: Add '0.3125' to each side of the equation. -0.3125 + -5x + 0.3125 + x2 = 0 + 0.3125 Reorder the terms: -0.3125 + 0.3125 + -5x + x2 = 0 + 0.3125 Combine like terms: -0.3125 + 0.3125 = 0.0000 0.0000 + -5x + x2 = 0 + 0.3125 -5x + x2 = 0 + 0.3125 Combine like terms: 0 + 0.3125 = 0.3125 -5x + x2 = 0.3125 The x term is -5x. Take half its coefficient (-2.5). Square it (6.25) and add it to both sides. Add '6.25' to each side of the equation. -5x + 6.25 + x2 = 0.3125 + 6.25 Reorder the terms: 6.25 + -5x + x2 = 0.3125 + 6.25 Combine like terms: 0.3125 + 6.25 = 6.5625 6.25 + -5x + x2 = 6.5625 Factor a perfect square on the left side: (x + -2.5)(x + -2.5) = 6.5625 Calculate the square root of the right side: 2.561737691 Break this problem into two subproblems by setting (x + -2.5) equal to 2.561737691 and -2.561737691.Subproblem 1
x + -2.5 = 2.561737691 Simplifying x + -2.5 = 2.561737691 Reorder the terms: -2.5 + x = 2.561737691 Solving -2.5 + x = 2.561737691 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.5' to each side of the equation. -2.5 + 2.5 + x = 2.561737691 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + x = 2.561737691 + 2.5 x = 2.561737691 + 2.5 Combine like terms: 2.561737691 + 2.5 = 5.061737691 x = 5.061737691 Simplifying x = 5.061737691Subproblem 2
x + -2.5 = -2.561737691 Simplifying x + -2.5 = -2.561737691 Reorder the terms: -2.5 + x = -2.561737691 Solving -2.5 + x = -2.561737691 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.5' to each side of the equation. -2.5 + 2.5 + x = -2.561737691 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + x = -2.561737691 + 2.5 x = -2.561737691 + 2.5 Combine like terms: -2.561737691 + 2.5 = -0.061737691 x = -0.061737691 Simplifying x = -0.061737691Solution
The solution to the problem is based on the solutions from the subproblems. x = {5.061737691, -0.061737691}
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