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Simplifying (7 + x)(5 + x) = 70 Multiply (7 + x) * (5 + x) (7(5 + x) + x(5 + x)) = 70 ((5 * 7 + x * 7) + x(5 + x)) = 70 ((35 + 7x) + x(5 + x)) = 70 (35 + 7x + (5 * x + x * x)) = 70 (35 + 7x + (5x + x2)) = 70 Combine like terms: 7x + 5x = 12x (35 + 12x + x2) = 70 Solving 35 + 12x + x2 = 70 Solving for variable 'x'. Reorder the terms: 35 + -70 + 12x + x2 = 70 + -70 Combine like terms: 35 + -70 = -35 -35 + 12x + x2 = 70 + -70 Combine like terms: 70 + -70 = 0 -35 + 12x + x2 = 0 Begin completing the square. Move the constant term to the right: Add '35' to each side of the equation. -35 + 12x + 35 + x2 = 0 + 35 Reorder the terms: -35 + 35 + 12x + x2 = 0 + 35 Combine like terms: -35 + 35 = 0 0 + 12x + x2 = 0 + 35 12x + x2 = 0 + 35 Combine like terms: 0 + 35 = 35 12x + x2 = 35 The x term is 12x. Take half its coefficient (6). Square it (36) and add it to both sides. Add '36' to each side of the equation. 12x + 36 + x2 = 35 + 36 Reorder the terms: 36 + 12x + x2 = 35 + 36 Combine like terms: 35 + 36 = 71 36 + 12x + x2 = 71 Factor a perfect square on the left side: (x + 6)(x + 6) = 71 Calculate the square root of the right side: 8.426149773 Break this problem into two subproblems by setting (x + 6) equal to 8.426149773 and -8.426149773.Subproblem 1
x + 6 = 8.426149773 Simplifying x + 6 = 8.426149773 Reorder the terms: 6 + x = 8.426149773 Solving 6 + x = 8.426149773 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-6' to each side of the equation. 6 + -6 + x = 8.426149773 + -6 Combine like terms: 6 + -6 = 0 0 + x = 8.426149773 + -6 x = 8.426149773 + -6 Combine like terms: 8.426149773 + -6 = 2.426149773 x = 2.426149773 Simplifying x = 2.426149773Subproblem 2
x + 6 = -8.426149773 Simplifying x + 6 = -8.426149773 Reorder the terms: 6 + x = -8.426149773 Solving 6 + x = -8.426149773 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-6' to each side of the equation. 6 + -6 + x = -8.426149773 + -6 Combine like terms: 6 + -6 = 0 0 + x = -8.426149773 + -6 x = -8.426149773 + -6 Combine like terms: -8.426149773 + -6 = -14.426149773 x = -14.426149773 Simplifying x = -14.426149773Solution
The solution to the problem is based on the solutions from the subproblems. x = {2.426149773, -14.426149773}
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