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Simplifying b2 + -2b + -7 = 0 Reorder the terms: -7 + -2b + b2 = 0 Solving -7 + -2b + b2 = 0 Solving for variable 'b'. Begin completing the square. Move the constant term to the right: Add '7' to each side of the equation. -7 + -2b + 7 + b2 = 0 + 7 Reorder the terms: -7 + 7 + -2b + b2 = 0 + 7 Combine like terms: -7 + 7 = 0 0 + -2b + b2 = 0 + 7 -2b + b2 = 0 + 7 Combine like terms: 0 + 7 = 7 -2b + b2 = 7 The b term is -2b. Take half its coefficient (-1). Square it (1) and add it to both sides. Add '1' to each side of the equation. -2b + 1 + b2 = 7 + 1 Reorder the terms: 1 + -2b + b2 = 7 + 1 Combine like terms: 7 + 1 = 8 1 + -2b + b2 = 8 Factor a perfect square on the left side: (b + -1)(b + -1) = 8 Calculate the square root of the right side: 2.828427125 Break this problem into two subproblems by setting (b + -1) equal to 2.828427125 and -2.828427125.Subproblem 1
b + -1 = 2.828427125 Simplifying b + -1 = 2.828427125 Reorder the terms: -1 + b = 2.828427125 Solving -1 + b = 2.828427125 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + b = 2.828427125 + 1 Combine like terms: -1 + 1 = 0 0 + b = 2.828427125 + 1 b = 2.828427125 + 1 Combine like terms: 2.828427125 + 1 = 3.828427125 b = 3.828427125 Simplifying b = 3.828427125Subproblem 2
b + -1 = -2.828427125 Simplifying b + -1 = -2.828427125 Reorder the terms: -1 + b = -2.828427125 Solving -1 + b = -2.828427125 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + b = -2.828427125 + 1 Combine like terms: -1 + 1 = 0 0 + b = -2.828427125 + 1 b = -2.828427125 + 1 Combine like terms: -2.828427125 + 1 = -1.828427125 b = -1.828427125 Simplifying b = -1.828427125Solution
The solution to the problem is based on the solutions from the subproblems. b = {3.828427125, -1.828427125}
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