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Simplifying (x + -4)(x + -4) = 18 Reorder the terms: (-4 + x)(x + -4) = 18 Reorder the terms: (-4 + x)(-4 + x) = 18 Multiply (-4 + x) * (-4 + x) (-4(-4 + x) + x(-4 + x)) = 18 ((-4 * -4 + x * -4) + x(-4 + x)) = 18 ((16 + -4x) + x(-4 + x)) = 18 (16 + -4x + (-4 * x + x * x)) = 18 (16 + -4x + (-4x + x2)) = 18 Combine like terms: -4x + -4x = -8x (16 + -8x + x2) = 18 Solving 16 + -8x + x2 = 18 Solving for variable 'x'. Reorder the terms: 16 + -18 + -8x + x2 = 18 + -18 Combine like terms: 16 + -18 = -2 -2 + -8x + x2 = 18 + -18 Combine like terms: 18 + -18 = 0 -2 + -8x + x2 = 0 Begin completing the square. Move the constant term to the right: Add '2' to each side of the equation. -2 + -8x + 2 + x2 = 0 + 2 Reorder the terms: -2 + 2 + -8x + x2 = 0 + 2 Combine like terms: -2 + 2 = 0 0 + -8x + x2 = 0 + 2 -8x + x2 = 0 + 2 Combine like terms: 0 + 2 = 2 -8x + x2 = 2 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 = 2 + 16 Reorder the terms: 16 + -8x + x2 = 2 + 16 Combine like terms: 2 + 16 = 18 16 + -8x + x2 = 18 Factor a perfect square on the left side: (x + -4)(x + -4) = 18 Calculate the square root of the right side: 4.242640687 Break this problem into two subproblems by setting (x + -4) equal to 4.242640687 and -4.242640687.Subproblem 1
x + -4 = 4.242640687 Simplifying x + -4 = 4.242640687 Reorder the terms: -4 + x = 4.242640687 Solving -4 + x = 4.242640687 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 = 4.242640687 + 4 Combine like terms: -4 + 4 = 0 0 + x = 4.242640687 + 4 x = 4.242640687 + 4 Combine like terms: 4.242640687 + 4 = 8.242640687 x = 8.242640687 Simplifying x = 8.242640687Subproblem 2
x + -4 = -4.242640687 Simplifying x + -4 = -4.242640687 Reorder the terms: -4 + x = -4.242640687 Solving -4 + x = -4.242640687 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 = -4.242640687 + 4 Combine like terms: -4 + 4 = 0 0 + x = -4.242640687 + 4 x = -4.242640687 + 4 Combine like terms: -4.242640687 + 4 = -0.242640687 x = -0.242640687 Simplifying x = -0.242640687Solution
The solution to the problem is based on the solutions from the subproblems. x = {8.242640687, -0.242640687}
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