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Simplifying x2 + 18x = 5 Reorder the terms: 18x + x2 = 5 Solving 18x + x2 = 5 Solving for variable 'x'. Reorder the terms: -5 + 18x + x2 = 5 + -5 Combine like terms: 5 + -5 = 0 -5 + 18x + x2 = 0 Begin completing the square. Move the constant term to the right: Add '5' to each side of the equation. -5 + 18x + 5 + x2 = 0 + 5 Reorder the terms: -5 + 5 + 18x + x2 = 0 + 5 Combine like terms: -5 + 5 = 0 0 + 18x + x2 = 0 + 5 18x + x2 = 0 + 5 Combine like terms: 0 + 5 = 5 18x + x2 = 5 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 = 5 + 81 Reorder the terms: 81 + 18x + x2 = 5 + 81 Combine like terms: 5 + 81 = 86 81 + 18x + x2 = 86 Factor a perfect square on the left side: (x + 9)(x + 9) = 86 Calculate the square root of the right side: 9.273618495 Break this problem into two subproblems by setting (x + 9) equal to 9.273618495 and -9.273618495.Subproblem 1
x + 9 = 9.273618495 Simplifying x + 9 = 9.273618495 Reorder the terms: 9 + x = 9.273618495 Solving 9 + x = 9.273618495 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 = 9.273618495 + -9 Combine like terms: 9 + -9 = 0 0 + x = 9.273618495 + -9 x = 9.273618495 + -9 Combine like terms: 9.273618495 + -9 = 0.273618495 x = 0.273618495 Simplifying x = 0.273618495Subproblem 2
x + 9 = -9.273618495 Simplifying x + 9 = -9.273618495 Reorder the terms: 9 + x = -9.273618495 Solving 9 + x = -9.273618495 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 = -9.273618495 + -9 Combine like terms: 9 + -9 = 0 0 + x = -9.273618495 + -9 x = -9.273618495 + -9 Combine like terms: -9.273618495 + -9 = -18.273618495 x = -18.273618495 Simplifying x = -18.273618495Solution
The solution to the problem is based on the solutions from the subproblems. x = {0.273618495, -18.273618495}
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