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Simplifying 8x2 + -9x + 81 = 0 Reorder the terms: 81 + -9x + 8x2 = 0 Solving 81 + -9x + 8x2 = 0 Solving for variable 'x'. Begin completing the square. Divide all terms by 8 the coefficient of the squared term: Divide each side by '8'. 10.125 + -1.125x + x2 = 0 Move the constant term to the right: Add '-10.125' to each side of the equation. 10.125 + -1.125x + -10.125 + x2 = 0 + -10.125 Reorder the terms: 10.125 + -10.125 + -1.125x + x2 = 0 + -10.125 Combine like terms: 10.125 + -10.125 = 0.000 0.000 + -1.125x + x2 = 0 + -10.125 -1.125x + x2 = 0 + -10.125 Combine like terms: 0 + -10.125 = -10.125 -1.125x + x2 = -10.125 The x term is -1.125x. Take half its coefficient (-0.5625). Square it (0.31640625) and add it to both sides. Add '0.31640625' to each side of the equation. -1.125x + 0.31640625 + x2 = -10.125 + 0.31640625 Reorder the terms: 0.31640625 + -1.125x + x2 = -10.125 + 0.31640625 Combine like terms: -10.125 + 0.31640625 = -9.80859375 0.31640625 + -1.125x + x2 = -9.80859375 Factor a perfect square on the left side: (x + -0.5625)(x + -0.5625) = -9.80859375 Can't calculate square root of the right side. The solution to this equation could not be determined.
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