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Simplifying x2 + -18x = -1 Reorder the terms: -18x + x2 = -1 Solving -18x + x2 = -1 Solving for variable 'x'. Reorder the terms: 1 + -18x + x2 = -1 + 1 Combine like terms: -1 + 1 = 0 1 + -18x + x2 = 0 Begin completing the square. Move the constant term to the right: Add '-1' to each side of the equation. 1 + -18x + -1 + x2 = 0 + -1 Reorder the terms: 1 + -1 + -18x + x2 = 0 + -1 Combine like terms: 1 + -1 = 0 0 + -18x + x2 = 0 + -1 -18x + x2 = 0 + -1 Combine like terms: 0 + -1 = -1 -18x + x2 = -1 The x term is -18x. Take half its coefficient (-9). Square it (81) and add it to both sides. Add '81' to each side of the equation. -18x + 81 + x2 = -1 + 81 Reorder the terms: 81 + -18x + x2 = -1 + 81 Combine like terms: -1 + 81 = 80 81 + -18x + x2 = 80 Factor a perfect square on the left side: (x + -9)(x + -9) = 80 Calculate the square root of the right side: 8.94427191 Break this problem into two subproblems by setting (x + -9) equal to 8.94427191 and -8.94427191.Subproblem 1
x + -9 = 8.94427191 Simplifying x + -9 = 8.94427191 Reorder the terms: -9 + x = 8.94427191 Solving -9 + x = 8.94427191 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + x = 8.94427191 + 9 Combine like terms: -9 + 9 = 0 0 + x = 8.94427191 + 9 x = 8.94427191 + 9 Combine like terms: 8.94427191 + 9 = 17.94427191 x = 17.94427191 Simplifying x = 17.94427191Subproblem 2
x + -9 = -8.94427191 Simplifying x + -9 = -8.94427191 Reorder the terms: -9 + x = -8.94427191 Solving -9 + x = -8.94427191 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + x = -8.94427191 + 9 Combine like terms: -9 + 9 = 0 0 + x = -8.94427191 + 9 x = -8.94427191 + 9 Combine like terms: -8.94427191 + 9 = 0.05572809 x = 0.05572809 Simplifying x = 0.05572809Solution
The solution to the problem is based on the solutions from the subproblems. x = {17.94427191, 0.05572809}
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