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Simplifying 15c2 + -23c + 28 = 0 Reorder the terms: 28 + -23c + 15c2 = 0 Solving 28 + -23c + 15c2 = 0 Solving for variable 'c'. Begin completing the square. Divide all terms by 15 the coefficient of the squared term: Divide each side by '15'. 1.866666667 + -1.533333333c + c2 = 0 Move the constant term to the right: Add '-1.866666667' to each side of the equation. 1.866666667 + -1.533333333c + -1.866666667 + c2 = 0 + -1.866666667 Reorder the terms: 1.866666667 + -1.866666667 + -1.533333333c + c2 = 0 + -1.866666667 Combine like terms: 1.866666667 + -1.866666667 = 0.000000000 0.000000000 + -1.533333333c + c2 = 0 + -1.866666667 -1.533333333c + c2 = 0 + -1.866666667 Combine like terms: 0 + -1.866666667 = -1.866666667 -1.533333333c + c2 = -1.866666667 The c term is -1.533333333c. Take half its coefficient (-0.7666666665). Square it (0.5877777775) and add it to both sides. Add '0.5877777775' to each side of the equation. -1.533333333c + 0.5877777775 + c2 = -1.866666667 + 0.5877777775 Reorder the terms: 0.5877777775 + -1.533333333c + c2 = -1.866666667 + 0.5877777775 Combine like terms: -1.866666667 + 0.5877777775 = -1.2788888895 0.5877777775 + -1.533333333c + c2 = -1.2788888895 Factor a perfect square on the left side: (c + -0.7666666665)(c + -0.7666666665) = -1.2788888895 Can't calculate square root of the right side. The solution to this equation could not be determined.
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