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Simplifying 2b2 + 10b + 15 = 0 Reorder the terms: 15 + 10b + 2b2 = 0 Solving 15 + 10b + 2b2 = 0 Solving for variable 'b'. Begin completing the square. Divide all terms by 2 the coefficient of the squared term: Divide each side by '2'. 7.5 + 5b + b2 = 0 Move the constant term to the right: Add '-7.5' to each side of the equation. 7.5 + 5b + -7.5 + b2 = 0 + -7.5 Reorder the terms: 7.5 + -7.5 + 5b + b2 = 0 + -7.5 Combine like terms: 7.5 + -7.5 = 0.0 0.0 + 5b + b2 = 0 + -7.5 5b + b2 = 0 + -7.5 Combine like terms: 0 + -7.5 = -7.5 5b + b2 = -7.5 The b term is 5b. Take half its coefficient (2.5). Square it (6.25) and add it to both sides. Add '6.25' to each side of the equation. 5b + 6.25 + b2 = -7.5 + 6.25 Reorder the terms: 6.25 + 5b + b2 = -7.5 + 6.25 Combine like terms: -7.5 + 6.25 = -1.25 6.25 + 5b + b2 = -1.25 Factor a perfect square on the left side: (b + 2.5)(b + 2.5) = -1.25 Can't calculate square root of the right side. The solution to this equation could not be determined.
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