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Simplifying (x + 2)(x + 2) = 72 Reorder the terms: (2 + x)(x + 2) = 72 Reorder the terms: (2 + x)(2 + x) = 72 Multiply (2 + x) * (2 + x) (2(2 + x) + x(2 + x)) = 72 ((2 * 2 + x * 2) + x(2 + x)) = 72 ((4 + 2x) + x(2 + x)) = 72 (4 + 2x + (2 * x + x * x)) = 72 (4 + 2x + (2x + x2)) = 72 Combine like terms: 2x + 2x = 4x (4 + 4x + x2) = 72 Solving 4 + 4x + x2 = 72 Solving for variable 'x'. Reorder the terms: 4 + -72 + 4x + x2 = 72 + -72 Combine like terms: 4 + -72 = -68 -68 + 4x + x2 = 72 + -72 Combine like terms: 72 + -72 = 0 -68 + 4x + x2 = 0 Begin completing the square. Move the constant term to the right: Add '68' to each side of the equation. -68 + 4x + 68 + x2 = 0 + 68 Reorder the terms: -68 + 68 + 4x + x2 = 0 + 68 Combine like terms: -68 + 68 = 0 0 + 4x + x2 = 0 + 68 4x + x2 = 0 + 68 Combine like terms: 0 + 68 = 68 4x + x2 = 68 The x term is 4x. Take half its coefficient (2). Square it (4) and add it to both sides. Add '4' to each side of the equation. 4x + 4 + x2 = 68 + 4 Reorder the terms: 4 + 4x + x2 = 68 + 4 Combine like terms: 68 + 4 = 72 4 + 4x + x2 = 72 Factor a perfect square on the left side: (x + 2)(x + 2) = 72 Calculate the square root of the right side: 8.485281374 Break this problem into two subproblems by setting (x + 2) equal to 8.485281374 and -8.485281374.Subproblem 1
x + 2 = 8.485281374 Simplifying x + 2 = 8.485281374 Reorder the terms: 2 + x = 8.485281374 Solving 2 + x = 8.485281374 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + x = 8.485281374 + -2 Combine like terms: 2 + -2 = 0 0 + x = 8.485281374 + -2 x = 8.485281374 + -2 Combine like terms: 8.485281374 + -2 = 6.485281374 x = 6.485281374 Simplifying x = 6.485281374Subproblem 2
x + 2 = -8.485281374 Simplifying x + 2 = -8.485281374 Reorder the terms: 2 + x = -8.485281374 Solving 2 + x = -8.485281374 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + x = -8.485281374 + -2 Combine like terms: 2 + -2 = 0 0 + x = -8.485281374 + -2 x = -8.485281374 + -2 Combine like terms: -8.485281374 + -2 = -10.485281374 x = -10.485281374 Simplifying x = -10.485281374Solution
The solution to the problem is based on the solutions from the subproblems. x = {6.485281374, -10.485281374}
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