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Simplifying 81r2 + -16r + 64 = 0 Reorder the terms: 64 + -16r + 81r2 = 0 Solving 64 + -16r + 81r2 = 0 Solving for variable 'r'. Begin completing the square. Divide all terms by 81 the coefficient of the squared term: Divide each side by '81'. 0.7901234568 + -0.1975308642r + r2 = 0 Move the constant term to the right: Add '-0.7901234568' to each side of the equation. 0.7901234568 + -0.1975308642r + -0.7901234568 + r2 = 0 + -0.7901234568 Reorder the terms: 0.7901234568 + -0.7901234568 + -0.1975308642r + r2 = 0 + -0.7901234568 Combine like terms: 0.7901234568 + -0.7901234568 = 0.0000000000 0.0000000000 + -0.1975308642r + r2 = 0 + -0.7901234568 -0.1975308642r + r2 = 0 + -0.7901234568 Combine like terms: 0 + -0.7901234568 = -0.7901234568 -0.1975308642r + r2 = -0.7901234568 The r term is -0.1975308642r. Take half its coefficient (-0.0987654321). Square it (0.009754610578) and add it to both sides. Add '0.009754610578' to each side of the equation. -0.1975308642r + 0.009754610578 + r2 = -0.7901234568 + 0.009754610578 Reorder the terms: 0.009754610578 + -0.1975308642r + r2 = -0.7901234568 + 0.009754610578 Combine like terms: -0.7901234568 + 0.009754610578 = -0.780368846222 0.009754610578 + -0.1975308642r + r2 = -0.780368846222 Factor a perfect square on the left side: (r + -0.0987654321)(r + -0.0987654321) = -0.780368846222 Can't calculate square root of the right side. The solution to this equation could not be determined.
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