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Simplifying (c2 + -6c) + (7c + 5) = 0 Reorder the terms: (-6c + c2) + (7c + 5) = 0 Remove parenthesis around (-6c + c2) -6c + c2 + (7c + 5) = 0 Reorder the terms: -6c + c2 + (5 + 7c) = 0 Remove parenthesis around (5 + 7c) -6c + c2 + 5 + 7c = 0 Reorder the terms: 5 + -6c + 7c + c2 = 0 Combine like terms: -6c + 7c = 1c 5 + 1c + c2 = 0 Solving 5 + 1c + c2 = 0 Solving for variable 'c'. Begin completing the square. Move the constant term to the right: Add '-5' to each side of the equation. 5 + 1c + -5 + c2 = 0 + -5 Reorder the terms: 5 + -5 + 1c + c2 = 0 + -5 Combine like terms: 5 + -5 = 0 0 + 1c + c2 = 0 + -5 1c + c2 = 0 + -5 Combine like terms: 0 + -5 = -5 1c + c2 = -5 The c term is 1c. Take half its coefficient (0.5). Square it (0.25) and add it to both sides. Add '0.25' to each side of the equation. c + 0.25 + c2 = -5 + 0.25 Reorder the terms: 0.25 + c + c2 = -5 + 0.25 Combine like terms: -5 + 0.25 = -4.75 0.25 + c + c2 = -4.75 Factor a perfect square on the left side: (c + 0.5)(c + 0.5) = -4.75 Can't calculate square root of the right side. The solution to this equation could not be determined.
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