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Simplifying 0 = -16x2 + 72x + 5 Reorder the terms: 0 = 5 + 72x + -16x2 Solving 0 = 5 + 72x + -16x2 Solving for variable 'x'. Combine like terms: 0 + -5 = -5 -5 + -72x + 16x2 = 5 + 72x + -16x2 + -5 + -72x + 16x2 Reorder the terms: -5 + -72x + 16x2 = 5 + -5 + 72x + -72x + -16x2 + 16x2 Combine like terms: 5 + -5 = 0 -5 + -72x + 16x2 = 0 + 72x + -72x + -16x2 + 16x2 -5 + -72x + 16x2 = 72x + -72x + -16x2 + 16x2 Combine like terms: 72x + -72x = 0 -5 + -72x + 16x2 = 0 + -16x2 + 16x2 -5 + -72x + 16x2 = -16x2 + 16x2 Combine like terms: -16x2 + 16x2 = 0 -5 + -72x + 16x2 = 0 Begin completing the square. Divide all terms by 16 the coefficient of the squared term: Divide each side by '16'. -0.3125 + -4.5x + x2 = 0 Move the constant term to the right: Add '0.3125' to each side of the equation. -0.3125 + -4.5x + 0.3125 + x2 = 0 + 0.3125 Reorder the terms: -0.3125 + 0.3125 + -4.5x + x2 = 0 + 0.3125 Combine like terms: -0.3125 + 0.3125 = 0.0000 0.0000 + -4.5x + x2 = 0 + 0.3125 -4.5x + x2 = 0 + 0.3125 Combine like terms: 0 + 0.3125 = 0.3125 -4.5x + x2 = 0.3125 The x term is -4.5x. Take half its coefficient (-2.25). Square it (5.0625) and add it to both sides. Add '5.0625' to each side of the equation. -4.5x + 5.0625 + x2 = 0.3125 + 5.0625 Reorder the terms: 5.0625 + -4.5x + x2 = 0.3125 + 5.0625 Combine like terms: 0.3125 + 5.0625 = 5.375 5.0625 + -4.5x + x2 = 5.375 Factor a perfect square on the left side: (x + -2.25)(x + -2.25) = 5.375 Calculate the square root of the right side: 2.318404624 Break this problem into two subproblems by setting (x + -2.25) equal to 2.318404624 and -2.318404624.Subproblem 1
x + -2.25 = 2.318404624 Simplifying x + -2.25 = 2.318404624 Reorder the terms: -2.25 + x = 2.318404624 Solving -2.25 + x = 2.318404624 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.25' to each side of the equation. -2.25 + 2.25 + x = 2.318404624 + 2.25 Combine like terms: -2.25 + 2.25 = 0.00 0.00 + x = 2.318404624 + 2.25 x = 2.318404624 + 2.25 Combine like terms: 2.318404624 + 2.25 = 4.568404624 x = 4.568404624 Simplifying x = 4.568404624Subproblem 2
x + -2.25 = -2.318404624 Simplifying x + -2.25 = -2.318404624 Reorder the terms: -2.25 + x = -2.318404624 Solving -2.25 + x = -2.318404624 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.25' to each side of the equation. -2.25 + 2.25 + x = -2.318404624 + 2.25 Combine like terms: -2.25 + 2.25 = 0.00 0.00 + x = -2.318404624 + 2.25 x = -2.318404624 + 2.25 Combine like terms: -2.318404624 + 2.25 = -0.068404624 x = -0.068404624 Simplifying x = -0.068404624Solution
The solution to the problem is based on the solutions from the subproblems. x = {4.568404624, -0.068404624}
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