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Simplifying b2 + -9b + 4 = 0 Reorder the terms: 4 + -9b + b2 = 0 Solving 4 + -9b + b2 = 0 Solving for variable 'b'. Begin completing the square. Move the constant term to the right: Add '-4' to each side of the equation. 4 + -9b + -4 + b2 = 0 + -4 Reorder the terms: 4 + -4 + -9b + b2 = 0 + -4 Combine like terms: 4 + -4 = 0 0 + -9b + b2 = 0 + -4 -9b + b2 = 0 + -4 Combine like terms: 0 + -4 = -4 -9b + b2 = -4 The b term is -9b. Take half its coefficient (-4.5). Square it (20.25) and add it to both sides. Add '20.25' to each side of the equation. -9b + 20.25 + b2 = -4 + 20.25 Reorder the terms: 20.25 + -9b + b2 = -4 + 20.25 Combine like terms: -4 + 20.25 = 16.25 20.25 + -9b + b2 = 16.25 Factor a perfect square on the left side: (b + -4.5)(b + -4.5) = 16.25 Calculate the square root of the right side: 4.031128874 Break this problem into two subproblems by setting (b + -4.5) equal to 4.031128874 and -4.031128874.Subproblem 1
b + -4.5 = 4.031128874 Simplifying b + -4.5 = 4.031128874 Reorder the terms: -4.5 + b = 4.031128874 Solving -4.5 + b = 4.031128874 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '4.5' to each side of the equation. -4.5 + 4.5 + b = 4.031128874 + 4.5 Combine like terms: -4.5 + 4.5 = 0.0 0.0 + b = 4.031128874 + 4.5 b = 4.031128874 + 4.5 Combine like terms: 4.031128874 + 4.5 = 8.531128874 b = 8.531128874 Simplifying b = 8.531128874Subproblem 2
b + -4.5 = -4.031128874 Simplifying b + -4.5 = -4.031128874 Reorder the terms: -4.5 + b = -4.031128874 Solving -4.5 + b = -4.031128874 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '4.5' to each side of the equation. -4.5 + 4.5 + b = -4.031128874 + 4.5 Combine like terms: -4.5 + 4.5 = 0.0 0.0 + b = -4.031128874 + 4.5 b = -4.031128874 + 4.5 Combine like terms: -4.031128874 + 4.5 = 0.468871126 b = 0.468871126 Simplifying b = 0.468871126Solution
The solution to the problem is based on the solutions from the subproblems. b = {8.531128874, 0.468871126}
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