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Simplifying x2 + -18x + 81 = 5 Reorder the terms: 81 + -18x + x2 = 5 Solving 81 + -18x + x2 = 5 Solving for variable 'x'. Reorder the terms: 81 + -5 + -18x + x2 = 5 + -5 Combine like terms: 81 + -5 = 76 76 + -18x + x2 = 5 + -5 Combine like terms: 5 + -5 = 0 76 + -18x + x2 = 0 Begin completing the square. Move the constant term to the right: Add '-76' to each side of the equation. 76 + -18x + -76 + x2 = 0 + -76 Reorder the terms: 76 + -76 + -18x + x2 = 0 + -76 Combine like terms: 76 + -76 = 0 0 + -18x + x2 = 0 + -76 -18x + x2 = 0 + -76 Combine like terms: 0 + -76 = -76 -18x + x2 = -76 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 = -76 + 81 Reorder the terms: 81 + -18x + x2 = -76 + 81 Combine like terms: -76 + 81 = 5 81 + -18x + x2 = 5 Factor a perfect square on the left side: (x + -9)(x + -9) = 5 Calculate the square root of the right side: 2.236067978 Break this problem into two subproblems by setting (x + -9) equal to 2.236067978 and -2.236067978.Subproblem 1
x + -9 = 2.236067978 Simplifying x + -9 = 2.236067978 Reorder the terms: -9 + x = 2.236067978 Solving -9 + x = 2.236067978 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 = 2.236067978 + 9 Combine like terms: -9 + 9 = 0 0 + x = 2.236067978 + 9 x = 2.236067978 + 9 Combine like terms: 2.236067978 + 9 = 11.236067978 x = 11.236067978 Simplifying x = 11.236067978Subproblem 2
x + -9 = -2.236067978 Simplifying x + -9 = -2.236067978 Reorder the terms: -9 + x = -2.236067978 Solving -9 + x = -2.236067978 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 = -2.236067978 + 9 Combine like terms: -9 + 9 = 0 0 + x = -2.236067978 + 9 x = -2.236067978 + 9 Combine like terms: -2.236067978 + 9 = 6.763932022 x = 6.763932022 Simplifying x = 6.763932022Solution
The solution to the problem is based on the solutions from the subproblems. x = {11.236067978, 6.763932022}
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