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Simplifying x2 + 18x + -39 = 0 Reorder the terms: -39 + 18x + x2 = 0 Solving -39 + 18x + x2 = 0 Solving for variable 'x'. Begin completing the square. Move the constant term to the right: Add '39' to each side of the equation. -39 + 18x + 39 + x2 = 0 + 39 Reorder the terms: -39 + 39 + 18x + x2 = 0 + 39 Combine like terms: -39 + 39 = 0 0 + 18x + x2 = 0 + 39 18x + x2 = 0 + 39 Combine like terms: 0 + 39 = 39 18x + x2 = 39 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 = 39 + 81 Reorder the terms: 81 + 18x + x2 = 39 + 81 Combine like terms: 39 + 81 = 120 81 + 18x + x2 = 120 Factor a perfect square on the left side: (x + 9)(x + 9) = 120 Calculate the square root of the right side: 10.95445115 Break this problem into two subproblems by setting (x + 9) equal to 10.95445115 and -10.95445115.Subproblem 1
x + 9 = 10.95445115 Simplifying x + 9 = 10.95445115 Reorder the terms: 9 + x = 10.95445115 Solving 9 + x = 10.95445115 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 = 10.95445115 + -9 Combine like terms: 9 + -9 = 0 0 + x = 10.95445115 + -9 x = 10.95445115 + -9 Combine like terms: 10.95445115 + -9 = 1.95445115 x = 1.95445115 Simplifying x = 1.95445115Subproblem 2
x + 9 = -10.95445115 Simplifying x + 9 = -10.95445115 Reorder the terms: 9 + x = -10.95445115 Solving 9 + x = -10.95445115 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 = -10.95445115 + -9 Combine like terms: 9 + -9 = 0 0 + x = -10.95445115 + -9 x = -10.95445115 + -9 Combine like terms: -10.95445115 + -9 = -19.95445115 x = -19.95445115 Simplifying x = -19.95445115Solution
The solution to the problem is based on the solutions from the subproblems. x = {1.95445115, -19.95445115}
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