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Simplifying x2 + 11x + 28 = 8 Reorder the terms: 28 + 11x + x2 = 8 Solving 28 + 11x + x2 = 8 Solving for variable 'x'. Reorder the terms: 28 + -8 + 11x + x2 = 8 + -8 Combine like terms: 28 + -8 = 20 20 + 11x + x2 = 8 + -8 Combine like terms: 8 + -8 = 0 20 + 11x + x2 = 0 Begin completing the square. Move the constant term to the right: Add '-20' to each side of the equation. 20 + 11x + -20 + x2 = 0 + -20 Reorder the terms: 20 + -20 + 11x + x2 = 0 + -20 Combine like terms: 20 + -20 = 0 0 + 11x + x2 = 0 + -20 11x + x2 = 0 + -20 Combine like terms: 0 + -20 = -20 11x + x2 = -20 The x term is 11x. Take half its coefficient (5.5). Square it (30.25) and add it to both sides. Add '30.25' to each side of the equation. 11x + 30.25 + x2 = -20 + 30.25 Reorder the terms: 30.25 + 11x + x2 = -20 + 30.25 Combine like terms: -20 + 30.25 = 10.25 30.25 + 11x + x2 = 10.25 Factor a perfect square on the left side: (x + 5.5)(x + 5.5) = 10.25 Calculate the square root of the right side: 3.201562119 Break this problem into two subproblems by setting (x + 5.5) equal to 3.201562119 and -3.201562119.Subproblem 1
x + 5.5 = 3.201562119 Simplifying x + 5.5 = 3.201562119 Reorder the terms: 5.5 + x = 3.201562119 Solving 5.5 + x = 3.201562119 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5.5' to each side of the equation. 5.5 + -5.5 + x = 3.201562119 + -5.5 Combine like terms: 5.5 + -5.5 = 0.0 0.0 + x = 3.201562119 + -5.5 x = 3.201562119 + -5.5 Combine like terms: 3.201562119 + -5.5 = -2.298437881 x = -2.298437881 Simplifying x = -2.298437881Subproblem 2
x + 5.5 = -3.201562119 Simplifying x + 5.5 = -3.201562119 Reorder the terms: 5.5 + x = -3.201562119 Solving 5.5 + x = -3.201562119 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5.5' to each side of the equation. 5.5 + -5.5 + x = -3.201562119 + -5.5 Combine like terms: 5.5 + -5.5 = 0.0 0.0 + x = -3.201562119 + -5.5 x = -3.201562119 + -5.5 Combine like terms: -3.201562119 + -5.5 = -8.701562119 x = -8.701562119 Simplifying x = -8.701562119Solution
The solution to the problem is based on the solutions from the subproblems. x = {-2.298437881, -8.701562119}
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