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Simplifying x2 + 28x + 7 = 0 Reorder the terms: 7 + 28x + x2 = 0 Solving 7 + 28x + x2 = 0 Solving for variable 'x'. Begin completing the square. Move the constant term to the right: Add '-7' to each side of the equation. 7 + 28x + -7 + x2 = 0 + -7 Reorder the terms: 7 + -7 + 28x + x2 = 0 + -7 Combine like terms: 7 + -7 = 0 0 + 28x + x2 = 0 + -7 28x + x2 = 0 + -7 Combine like terms: 0 + -7 = -7 28x + x2 = -7 The x term is 28x. Take half its coefficient (14). Square it (196) and add it to both sides. Add '196' to each side of the equation. 28x + 196 + x2 = -7 + 196 Reorder the terms: 196 + 28x + x2 = -7 + 196 Combine like terms: -7 + 196 = 189 196 + 28x + x2 = 189 Factor a perfect square on the left side: (x + 14)(x + 14) = 189 Calculate the square root of the right side: 13.747727085 Break this problem into two subproblems by setting (x + 14) equal to 13.747727085 and -13.747727085.Subproblem 1
x + 14 = 13.747727085 Simplifying x + 14 = 13.747727085 Reorder the terms: 14 + x = 13.747727085 Solving 14 + x = 13.747727085 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-14' to each side of the equation. 14 + -14 + x = 13.747727085 + -14 Combine like terms: 14 + -14 = 0 0 + x = 13.747727085 + -14 x = 13.747727085 + -14 Combine like terms: 13.747727085 + -14 = -0.252272915 x = -0.252272915 Simplifying x = -0.252272915Subproblem 2
x + 14 = -13.747727085 Simplifying x + 14 = -13.747727085 Reorder the terms: 14 + x = -13.747727085 Solving 14 + x = -13.747727085 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-14' to each side of the equation. 14 + -14 + x = -13.747727085 + -14 Combine like terms: 14 + -14 = 0 0 + x = -13.747727085 + -14 x = -13.747727085 + -14 Combine like terms: -13.747727085 + -14 = -27.747727085 x = -27.747727085 Simplifying x = -27.747727085Solution
The solution to the problem is based on the solutions from the subproblems. x = {-0.252272915, -27.747727085}
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