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Simplifying x2 + 8x = 169 Reorder the terms: 8x + x2 = 169 Solving 8x + x2 = 169 Solving for variable 'x'. Reorder the terms: -169 + 8x + x2 = 169 + -169 Combine like terms: 169 + -169 = 0 -169 + 8x + x2 = 0 Begin completing the square. Move the constant term to the right: Add '169' to each side of the equation. -169 + 8x + 169 + x2 = 0 + 169 Reorder the terms: -169 + 169 + 8x + x2 = 0 + 169 Combine like terms: -169 + 169 = 0 0 + 8x + x2 = 0 + 169 8x + x2 = 0 + 169 Combine like terms: 0 + 169 = 169 8x + x2 = 169 The x term is 8x. Take half its coefficient (4). Square it (16) and add it to both sides. Add '16' to each side of the equation. 8x + 16 + x2 = 169 + 16 Reorder the terms: 16 + 8x + x2 = 169 + 16 Combine like terms: 169 + 16 = 185 16 + 8x + x2 = 185 Factor a perfect square on the left side: (x + 4)(x + 4) = 185 Calculate the square root of the right side: 13.601470509 Break this problem into two subproblems by setting (x + 4) equal to 13.601470509 and -13.601470509.Subproblem 1
x + 4 = 13.601470509 Simplifying x + 4 = 13.601470509 Reorder the terms: 4 + x = 13.601470509 Solving 4 + x = 13.601470509 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + x = 13.601470509 + -4 Combine like terms: 4 + -4 = 0 0 + x = 13.601470509 + -4 x = 13.601470509 + -4 Combine like terms: 13.601470509 + -4 = 9.601470509 x = 9.601470509 Simplifying x = 9.601470509Subproblem 2
x + 4 = -13.601470509 Simplifying x + 4 = -13.601470509 Reorder the terms: 4 + x = -13.601470509 Solving 4 + x = -13.601470509 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + x = -13.601470509 + -4 Combine like terms: 4 + -4 = 0 0 + x = -13.601470509 + -4 x = -13.601470509 + -4 Combine like terms: -13.601470509 + -4 = -17.601470509 x = -17.601470509 Simplifying x = -17.601470509Solution
The solution to the problem is based on the solutions from the subproblems. x = {9.601470509, -17.601470509}
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