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Simplifying 8x2 + -21x + 64 = 0 Reorder the terms: 64 + -21x + 8x2 = 0 Solving 64 + -21x + 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'. 8 + -2.625x + x2 = 0 Move the constant term to the right: Add '-8' to each side of the equation. 8 + -2.625x + -8 + x2 = 0 + -8 Reorder the terms: 8 + -8 + -2.625x + x2 = 0 + -8 Combine like terms: 8 + -8 = 0 0 + -2.625x + x2 = 0 + -8 -2.625x + x2 = 0 + -8 Combine like terms: 0 + -8 = -8 -2.625x + x2 = -8 The x term is -2.625x. Take half its coefficient (-1.3125). Square it (1.72265625) and add it to both sides. Add '1.72265625' to each side of the equation. -2.625x + 1.72265625 + x2 = -8 + 1.72265625 Reorder the terms: 1.72265625 + -2.625x + x2 = -8 + 1.72265625 Combine like terms: -8 + 1.72265625 = -6.27734375 1.72265625 + -2.625x + x2 = -6.27734375 Factor a perfect square on the left side: (x + -1.3125)(x + -1.3125) = -6.27734375 Can't calculate square root of the right side. The solution to this equation could not be determined.
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