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Simplifying 16 + 2b = b2 + -4 Reorder the terms: 16 + 2b = -4 + b2 Solving 16 + 2b = -4 + b2 Solving for variable 'b'. Reorder the terms: 16 + 4 + 2b + -1b2 = -4 + b2 + 4 + -1b2 Combine like terms: 16 + 4 = 20 20 + 2b + -1b2 = -4 + b2 + 4 + -1b2 Reorder the terms: 20 + 2b + -1b2 = -4 + 4 + b2 + -1b2 Combine like terms: -4 + 4 = 0 20 + 2b + -1b2 = 0 + b2 + -1b2 20 + 2b + -1b2 = b2 + -1b2 Combine like terms: b2 + -1b2 = 0 20 + 2b + -1b2 = 0 Begin completing the square. Divide all terms by -1 the coefficient of the squared term: Divide each side by '-1'. -20 + -2b + b2 = 0 Move the constant term to the right: Add '20' to each side of the equation. -20 + -2b + 20 + b2 = 0 + 20 Reorder the terms: -20 + 20 + -2b + b2 = 0 + 20 Combine like terms: -20 + 20 = 0 0 + -2b + b2 = 0 + 20 -2b + b2 = 0 + 20 Combine like terms: 0 + 20 = 20 -2b + b2 = 20 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 = 20 + 1 Reorder the terms: 1 + -2b + b2 = 20 + 1 Combine like terms: 20 + 1 = 21 1 + -2b + b2 = 21 Factor a perfect square on the left side: (b + -1)(b + -1) = 21 Calculate the square root of the right side: 4.582575695 Break this problem into two subproblems by setting (b + -1) equal to 4.582575695 and -4.582575695.Subproblem 1
b + -1 = 4.582575695 Simplifying b + -1 = 4.582575695 Reorder the terms: -1 + b = 4.582575695 Solving -1 + b = 4.582575695 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 = 4.582575695 + 1 Combine like terms: -1 + 1 = 0 0 + b = 4.582575695 + 1 b = 4.582575695 + 1 Combine like terms: 4.582575695 + 1 = 5.582575695 b = 5.582575695 Simplifying b = 5.582575695Subproblem 2
b + -1 = -4.582575695 Simplifying b + -1 = -4.582575695 Reorder the terms: -1 + b = -4.582575695 Solving -1 + b = -4.582575695 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 = -4.582575695 + 1 Combine like terms: -1 + 1 = 0 0 + b = -4.582575695 + 1 b = -4.582575695 + 1 Combine like terms: -4.582575695 + 1 = -3.582575695 b = -3.582575695 Simplifying b = -3.582575695Solution
The solution to the problem is based on the solutions from the subproblems. b = {5.582575695, -3.582575695}
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