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Simplifying 8x2 + 5x + 21 = 0 Reorder the terms: 21 + 5x + 8x2 = 0 Solving 21 + 5x + 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'. 2.625 + 0.625x + x2 = 0 Move the constant term to the right: Add '-2.625' to each side of the equation. 2.625 + 0.625x + -2.625 + x2 = 0 + -2.625 Reorder the terms: 2.625 + -2.625 + 0.625x + x2 = 0 + -2.625 Combine like terms: 2.625 + -2.625 = 0.000 0.000 + 0.625x + x2 = 0 + -2.625 0.625x + x2 = 0 + -2.625 Combine like terms: 0 + -2.625 = -2.625 0.625x + x2 = -2.625 The x term is 0.625x. Take half its coefficient (0.3125). Square it (0.09765625) and add it to both sides. Add '0.09765625' to each side of the equation. 0.625x + 0.09765625 + x2 = -2.625 + 0.09765625 Reorder the terms: 0.09765625 + 0.625x + x2 = -2.625 + 0.09765625 Combine like terms: -2.625 + 0.09765625 = -2.52734375 0.09765625 + 0.625x + x2 = -2.52734375 Factor a perfect square on the left side: (x + 0.3125)(x + 0.3125) = -2.52734375 Can't calculate square root of the right side. The solution to this equation could not be determined.
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