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Simplifying x2 + 15x + -169 = 0 Reorder the terms: -169 + 15x + x2 = 0 Solving -169 + 15x + x2 = 0 Solving for variable 'x'. Begin completing the square. Move the constant term to the right: Add '169' to each side of the equation. -169 + 15x + 169 + x2 = 0 + 169 Reorder the terms: -169 + 169 + 15x + x2 = 0 + 169 Combine like terms: -169 + 169 = 0 0 + 15x + x2 = 0 + 169 15x + x2 = 0 + 169 Combine like terms: 0 + 169 = 169 15x + x2 = 169 The x term is 15x. Take half its coefficient (7.5). Square it (56.25) and add it to both sides. Add '56.25' to each side of the equation. 15x + 56.25 + x2 = 169 + 56.25 Reorder the terms: 56.25 + 15x + x2 = 169 + 56.25 Combine like terms: 169 + 56.25 = 225.25 56.25 + 15x + x2 = 225.25 Factor a perfect square on the left side: (x + 7.5)(x + 7.5) = 225.25 Calculate the square root of the right side: 15.00833102 Break this problem into two subproblems by setting (x + 7.5) equal to 15.00833102 and -15.00833102.Subproblem 1
x + 7.5 = 15.00833102 Simplifying x + 7.5 = 15.00833102 Reorder the terms: 7.5 + x = 15.00833102 Solving 7.5 + x = 15.00833102 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7.5' to each side of the equation. 7.5 + -7.5 + x = 15.00833102 + -7.5 Combine like terms: 7.5 + -7.5 = 0.0 0.0 + x = 15.00833102 + -7.5 x = 15.00833102 + -7.5 Combine like terms: 15.00833102 + -7.5 = 7.50833102 x = 7.50833102 Simplifying x = 7.50833102Subproblem 2
x + 7.5 = -15.00833102 Simplifying x + 7.5 = -15.00833102 Reorder the terms: 7.5 + x = -15.00833102 Solving 7.5 + x = -15.00833102 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7.5' to each side of the equation. 7.5 + -7.5 + x = -15.00833102 + -7.5 Combine like terms: 7.5 + -7.5 = 0.0 0.0 + x = -15.00833102 + -7.5 x = -15.00833102 + -7.5 Combine like terms: -15.00833102 + -7.5 = -22.50833102 x = -22.50833102 Simplifying x = -22.50833102Solution
The solution to the problem is based on the solutions from the subproblems. x = {7.50833102, -22.50833102}
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