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Simplifying (2r + 3)(2r + -1) = -1(3r + 11) Reorder the terms: (3 + 2r)(2r + -1) = -1(3r + 11) Reorder the terms: (3 + 2r)(-1 + 2r) = -1(3r + 11) Multiply (3 + 2r) * (-1 + 2r) (3(-1 + 2r) + 2r * (-1 + 2r)) = -1(3r + 11) ((-1 * 3 + 2r * 3) + 2r * (-1 + 2r)) = -1(3r + 11) ((-3 + 6r) + 2r * (-1 + 2r)) = -1(3r + 11) (-3 + 6r + (-1 * 2r + 2r * 2r)) = -1(3r + 11) (-3 + 6r + (-2r + 4r2)) = -1(3r + 11) Combine like terms: 6r + -2r = 4r (-3 + 4r + 4r2) = -1(3r + 11) Reorder the terms: -3 + 4r + 4r2 = -1(11 + 3r) -3 + 4r + 4r2 = (11 * -1 + 3r * -1) -3 + 4r + 4r2 = (-11 + -3r) Solving -3 + 4r + 4r2 = -11 + -3r Solving for variable 'r'. Reorder the terms: -3 + 11 + 4r + 3r + 4r2 = -11 + -3r + 11 + 3r Combine like terms: -3 + 11 = 8 8 + 4r + 3r + 4r2 = -11 + -3r + 11 + 3r Combine like terms: 4r + 3r = 7r 8 + 7r + 4r2 = -11 + -3r + 11 + 3r Reorder the terms: 8 + 7r + 4r2 = -11 + 11 + -3r + 3r Combine like terms: -11 + 11 = 0 8 + 7r + 4r2 = 0 + -3r + 3r 8 + 7r + 4r2 = -3r + 3r Combine like terms: -3r + 3r = 0 8 + 7r + 4r2 = 0 Begin completing the square. Divide all terms by 4 the coefficient of the squared term: Divide each side by '4'. 2 + 1.75r + r2 = 0 Move the constant term to the right: Add '-2' to each side of the equation. 2 + 1.75r + -2 + r2 = 0 + -2 Reorder the terms: 2 + -2 + 1.75r + r2 = 0 + -2 Combine like terms: 2 + -2 = 0 0 + 1.75r + r2 = 0 + -2 1.75r + r2 = 0 + -2 Combine like terms: 0 + -2 = -2 1.75r + r2 = -2 The r term is 1.75r. Take half its coefficient (0.875). Square it (0.765625) and add it to both sides. Add '0.765625' to each side of the equation. 1.75r + 0.765625 + r2 = -2 + 0.765625 Reorder the terms: 0.765625 + 1.75r + r2 = -2 + 0.765625 Combine like terms: -2 + 0.765625 = -1.234375 0.765625 + 1.75r + r2 = -1.234375 Factor a perfect square on the left side: (r + 0.875)(r + 0.875) = -1.234375 Can't calculate square root of the right side. The solution to this equation could not be determined.
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