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Simplifying x2 + 18x + 74 = 0 Reorder the terms: 74 + 18x + x2 = 0 Solving 74 + 18x + x2 = 0 Solving for variable 'x'. Begin completing the square. Move the constant term to the right: Add '-74' to each side of the equation. 74 + 18x + -74 + x2 = 0 + -74 Reorder the terms: 74 + -74 + 18x + x2 = 0 + -74 Combine like terms: 74 + -74 = 0 0 + 18x + x2 = 0 + -74 18x + x2 = 0 + -74 Combine like terms: 0 + -74 = -74 18x + x2 = -74 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 = -74 + 81 Reorder the terms: 81 + 18x + x2 = -74 + 81 Combine like terms: -74 + 81 = 7 81 + 18x + x2 = 7 Factor a perfect square on the left side: (x + 9)(x + 9) = 7 Calculate the square root of the right side: 2.645751311 Break this problem into two subproblems by setting (x + 9) equal to 2.645751311 and -2.645751311.Subproblem 1
x + 9 = 2.645751311 Simplifying x + 9 = 2.645751311 Reorder the terms: 9 + x = 2.645751311 Solving 9 + x = 2.645751311 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 = 2.645751311 + -9 Combine like terms: 9 + -9 = 0 0 + x = 2.645751311 + -9 x = 2.645751311 + -9 Combine like terms: 2.645751311 + -9 = -6.354248689 x = -6.354248689 Simplifying x = -6.354248689Subproblem 2
x + 9 = -2.645751311 Simplifying x + 9 = -2.645751311 Reorder the terms: 9 + x = -2.645751311 Solving 9 + x = -2.645751311 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 = -2.645751311 + -9 Combine like terms: 9 + -9 = 0 0 + x = -2.645751311 + -9 x = -2.645751311 + -9 Combine like terms: -2.645751311 + -9 = -11.645751311 x = -11.645751311 Simplifying x = -11.645751311Solution
The solution to the problem is based on the solutions from the subproblems. x = {-6.354248689, -11.645751311}
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