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Simplifying x2 + 18x = 79 Reorder the terms: 18x + x2 = 79 Solving 18x + x2 = 79 Solving for variable 'x'. Reorder the terms: -79 + 18x + x2 = 79 + -79 Combine like terms: 79 + -79 = 0 -79 + 18x + x2 = 0 Begin completing the square. Move the constant term to the right: Add '79' to each side of the equation. -79 + 18x + 79 + x2 = 0 + 79 Reorder the terms: -79 + 79 + 18x + x2 = 0 + 79 Combine like terms: -79 + 79 = 0 0 + 18x + x2 = 0 + 79 18x + x2 = 0 + 79 Combine like terms: 0 + 79 = 79 18x + x2 = 79 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 = 79 + 81 Reorder the terms: 81 + 18x + x2 = 79 + 81 Combine like terms: 79 + 81 = 160 81 + 18x + x2 = 160 Factor a perfect square on the left side: (x + 9)(x + 9) = 160 Calculate the square root of the right side: 12.649110641 Break this problem into two subproblems by setting (x + 9) equal to 12.649110641 and -12.649110641.Subproblem 1
x + 9 = 12.649110641 Simplifying x + 9 = 12.649110641 Reorder the terms: 9 + x = 12.649110641 Solving 9 + x = 12.649110641 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 = 12.649110641 + -9 Combine like terms: 9 + -9 = 0 0 + x = 12.649110641 + -9 x = 12.649110641 + -9 Combine like terms: 12.649110641 + -9 = 3.649110641 x = 3.649110641 Simplifying x = 3.649110641Subproblem 2
x + 9 = -12.649110641 Simplifying x + 9 = -12.649110641 Reorder the terms: 9 + x = -12.649110641 Solving 9 + x = -12.649110641 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 = -12.649110641 + -9 Combine like terms: 9 + -9 = 0 0 + x = -12.649110641 + -9 x = -12.649110641 + -9 Combine like terms: -12.649110641 + -9 = -21.649110641 x = -21.649110641 Simplifying x = -21.649110641Solution
The solution to the problem is based on the solutions from the subproblems. x = {3.649110641, -21.649110641}
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