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Simplifying -1x2 + 7x + 72 = 0 Reorder the terms: 72 + 7x + -1x2 = 0 Solving 72 + 7x + -1x2 = 0 Solving for variable 'x'. Begin completing the square. Divide all terms by -1 the coefficient of the squared term: Divide each side by '-1'. -72 + -7x + x2 = 0 Move the constant term to the right: Add '72' to each side of the equation. -72 + -7x + 72 + x2 = 0 + 72 Reorder the terms: -72 + 72 + -7x + x2 = 0 + 72 Combine like terms: -72 + 72 = 0 0 + -7x + x2 = 0 + 72 -7x + x2 = 0 + 72 Combine like terms: 0 + 72 = 72 -7x + x2 = 72 The x term is -7x. Take half its coefficient (-3.5). Square it (12.25) and add it to both sides. Add '12.25' to each side of the equation. -7x + 12.25 + x2 = 72 + 12.25 Reorder the terms: 12.25 + -7x + x2 = 72 + 12.25 Combine like terms: 72 + 12.25 = 84.25 12.25 + -7x + x2 = 84.25 Factor a perfect square on the left side: (x + -3.5)(x + -3.5) = 84.25 Calculate the square root of the right side: 9.178779875 Break this problem into two subproblems by setting (x + -3.5) equal to 9.178779875 and -9.178779875.Subproblem 1
x + -3.5 = 9.178779875 Simplifying x + -3.5 = 9.178779875 Reorder the terms: -3.5 + x = 9.178779875 Solving -3.5 + x = 9.178779875 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.5' to each side of the equation. -3.5 + 3.5 + x = 9.178779875 + 3.5 Combine like terms: -3.5 + 3.5 = 0.0 0.0 + x = 9.178779875 + 3.5 x = 9.178779875 + 3.5 Combine like terms: 9.178779875 + 3.5 = 12.678779875 x = 12.678779875 Simplifying x = 12.678779875Subproblem 2
x + -3.5 = -9.178779875 Simplifying x + -3.5 = -9.178779875 Reorder the terms: -3.5 + x = -9.178779875 Solving -3.5 + x = -9.178779875 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.5' to each side of the equation. -3.5 + 3.5 + x = -9.178779875 + 3.5 Combine like terms: -3.5 + 3.5 = 0.0 0.0 + x = -9.178779875 + 3.5 x = -9.178779875 + 3.5 Combine like terms: -9.178779875 + 3.5 = -5.678779875 x = -5.678779875 Simplifying x = -5.678779875Solution
The solution to the problem is based on the solutions from the subproblems. x = {12.678779875, -5.678779875}
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