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Simplifying c2 + 5c + 84 = 0 Reorder the terms: 84 + 5c + c2 = 0 Solving 84 + 5c + c2 = 0 Solving for variable 'c'. Begin completing the square. Move the constant term to the right: Add '-84' to each side of the equation. 84 + 5c + -84 + c2 = 0 + -84 Reorder the terms: 84 + -84 + 5c + c2 = 0 + -84 Combine like terms: 84 + -84 = 0 0 + 5c + c2 = 0 + -84 5c + c2 = 0 + -84 Combine like terms: 0 + -84 = -84 5c + c2 = -84 The c term is 5c. 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. 5c + 6.25 + c2 = -84 + 6.25 Reorder the terms: 6.25 + 5c + c2 = -84 + 6.25 Combine like terms: -84 + 6.25 = -77.75 6.25 + 5c + c2 = -77.75 Factor a perfect square on the left side: (c + 2.5)(c + 2.5) = -77.75 Can't calculate square root of the right side. The solution to this equation could not be determined.
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