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Simplifying r2 + 21r + c = 0 Reorder the terms: c + 21r + r2 = 0 Solving c + 21r + r2 = 0 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '-21r' to each side of the equation. c + 21r + -21r + r2 = 0 + -21r Combine like terms: 21r + -21r = 0 c + 0 + r2 = 0 + -21r c + r2 = 0 + -21r Remove the zero: c + r2 = -21r Add '-1r2' to each side of the equation. c + r2 + -1r2 = -21r + -1r2 Combine like terms: r2 + -1r2 = 0 c + 0 = -21r + -1r2 c = -21r + -1r2 Simplifying c = -21r + -1r2
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