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Simplifying 8b2 + -6b + -18 = 0 Reorder the terms: -18 + -6b + 8b2 = 0 Solving -18 + -6b + 8b2 = 0 Solving for variable 'b'. Factor out the Greatest Common Factor (GCF), '2'. 2(-9 + -3b + 4b2) = 0 Ignore the factor 2.Subproblem 1
Set the factor '(-9 + -3b + 4b2)' equal to zero and attempt to solve: Simplifying -9 + -3b + 4b2 = 0 Solving -9 + -3b + 4b2 = 0 Begin completing the square. Divide all terms by 4 the coefficient of the squared term: Divide each side by '4'. -2.25 + -0.75b + b2 = 0 Move the constant term to the right: Add '2.25' to each side of the equation. -2.25 + -0.75b + 2.25 + b2 = 0 + 2.25 Reorder the terms: -2.25 + 2.25 + -0.75b + b2 = 0 + 2.25 Combine like terms: -2.25 + 2.25 = 0.00 0.00 + -0.75b + b2 = 0 + 2.25 -0.75b + b2 = 0 + 2.25 Combine like terms: 0 + 2.25 = 2.25 -0.75b + b2 = 2.25 The b term is -0.75b. Take half its coefficient (-0.375). Square it (0.140625) and add it to both sides. Add '0.140625' to each side of the equation. -0.75b + 0.140625 + b2 = 2.25 + 0.140625 Reorder the terms: 0.140625 + -0.75b + b2 = 2.25 + 0.140625 Combine like terms: 2.25 + 0.140625 = 2.390625 0.140625 + -0.75b + b2 = 2.390625 Factor a perfect square on the left side: (b + -0.375)(b + -0.375) = 2.390625 Calculate the square root of the right side: 1.54616461 Break this problem into two subproblems by setting (b + -0.375) equal to 1.54616461 and -1.54616461.Subproblem 1
b + -0.375 = 1.54616461 Simplifying b + -0.375 = 1.54616461 Reorder the terms: -0.375 + b = 1.54616461 Solving -0.375 + b = 1.54616461 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '0.375' to each side of the equation. -0.375 + 0.375 + b = 1.54616461 + 0.375 Combine like terms: -0.375 + 0.375 = 0.000 0.000 + b = 1.54616461 + 0.375 b = 1.54616461 + 0.375 Combine like terms: 1.54616461 + 0.375 = 1.92116461 b = 1.92116461 Simplifying b = 1.92116461Subproblem 2
b + -0.375 = -1.54616461 Simplifying b + -0.375 = -1.54616461 Reorder the terms: -0.375 + b = -1.54616461 Solving -0.375 + b = -1.54616461 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '0.375' to each side of the equation. -0.375 + 0.375 + b = -1.54616461 + 0.375 Combine like terms: -0.375 + 0.375 = 0.000 0.000 + b = -1.54616461 + 0.375 b = -1.54616461 + 0.375 Combine like terms: -1.54616461 + 0.375 = -1.17116461 b = -1.17116461 Simplifying b = -1.17116461Solution
The solution to the problem is based on the solutions from the subproblems. b = {1.92116461, -1.17116461}Solution
b = {1.92116461, -1.17116461}
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