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Simplifying (2x + 1)(x + 1) = 90 Reorder the terms: (1 + 2x)(x + 1) = 90 Reorder the terms: (1 + 2x)(1 + x) = 90 Multiply (1 + 2x) * (1 + x) (1(1 + x) + 2x * (1 + x)) = 90 ((1 * 1 + x * 1) + 2x * (1 + x)) = 90 ((1 + 1x) + 2x * (1 + x)) = 90 (1 + 1x + (1 * 2x + x * 2x)) = 90 (1 + 1x + (2x + 2x2)) = 90 Combine like terms: 1x + 2x = 3x (1 + 3x + 2x2) = 90 Solving 1 + 3x + 2x2 = 90 Solving for variable 'x'. Reorder the terms: 1 + -90 + 3x + 2x2 = 90 + -90 Combine like terms: 1 + -90 = -89 -89 + 3x + 2x2 = 90 + -90 Combine like terms: 90 + -90 = 0 -89 + 3x + 2x2 = 0 Begin completing the square. Divide all terms by 2 the coefficient of the squared term: Divide each side by '2'. -44.5 + 1.5x + x2 = 0 Move the constant term to the right: Add '44.5' to each side of the equation. -44.5 + 1.5x + 44.5 + x2 = 0 + 44.5 Reorder the terms: -44.5 + 44.5 + 1.5x + x2 = 0 + 44.5 Combine like terms: -44.5 + 44.5 = 0.0 0.0 + 1.5x + x2 = 0 + 44.5 1.5x + x2 = 0 + 44.5 Combine like terms: 0 + 44.5 = 44.5 1.5x + x2 = 44.5 The x term is 1.5x. Take half its coefficient (0.75). Square it (0.5625) and add it to both sides. Add '0.5625' to each side of the equation. 1.5x + 0.5625 + x2 = 44.5 + 0.5625 Reorder the terms: 0.5625 + 1.5x + x2 = 44.5 + 0.5625 Combine like terms: 44.5 + 0.5625 = 45.0625 0.5625 + 1.5x + x2 = 45.0625 Factor a perfect square on the left side: (x + 0.75)(x + 0.75) = 45.0625 Calculate the square root of the right side: 6.712860791 Break this problem into two subproblems by setting (x + 0.75) equal to 6.712860791 and -6.712860791.Subproblem 1
x + 0.75 = 6.712860791 Simplifying x + 0.75 = 6.712860791 Reorder the terms: 0.75 + x = 6.712860791 Solving 0.75 + x = 6.712860791 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.75' to each side of the equation. 0.75 + -0.75 + x = 6.712860791 + -0.75 Combine like terms: 0.75 + -0.75 = 0.00 0.00 + x = 6.712860791 + -0.75 x = 6.712860791 + -0.75 Combine like terms: 6.712860791 + -0.75 = 5.962860791 x = 5.962860791 Simplifying x = 5.962860791Subproblem 2
x + 0.75 = -6.712860791 Simplifying x + 0.75 = -6.712860791 Reorder the terms: 0.75 + x = -6.712860791 Solving 0.75 + x = -6.712860791 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.75' to each side of the equation. 0.75 + -0.75 + x = -6.712860791 + -0.75 Combine like terms: 0.75 + -0.75 = 0.00 0.00 + x = -6.712860791 + -0.75 x = -6.712860791 + -0.75 Combine like terms: -6.712860791 + -0.75 = -7.462860791 x = -7.462860791 Simplifying x = -7.462860791Solution
The solution to the problem is based on the solutions from the subproblems. x = {5.962860791, -7.462860791}
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