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Simplifying 4c2 + 9c + 15 = 0 Reorder the terms: 15 + 9c + 4c2 = 0 Solving 15 + 9c + 4c2 = 0 Solving for variable 'c'. Begin completing the square. Divide all terms by 4 the coefficient of the squared term: Divide each side by '4'. 3.75 + 2.25c + c2 = 0 Move the constant term to the right: Add '-3.75' to each side of the equation. 3.75 + 2.25c + -3.75 + c2 = 0 + -3.75 Reorder the terms: 3.75 + -3.75 + 2.25c + c2 = 0 + -3.75 Combine like terms: 3.75 + -3.75 = 0.00 0.00 + 2.25c + c2 = 0 + -3.75 2.25c + c2 = 0 + -3.75 Combine like terms: 0 + -3.75 = -3.75 2.25c + c2 = -3.75 The c term is 2.25c. Take half its coefficient (1.125). Square it (1.265625) and add it to both sides. Add '1.265625' to each side of the equation. 2.25c + 1.265625 + c2 = -3.75 + 1.265625 Reorder the terms: 1.265625 + 2.25c + c2 = -3.75 + 1.265625 Combine like terms: -3.75 + 1.265625 = -2.484375 1.265625 + 2.25c + c2 = -2.484375 Factor a perfect square on the left side: (c + 1.125)(c + 1.125) = -2.484375 Can't calculate square root of the right side. The solution to this equation could not be determined.
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