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Simplifying 391x2 + 28x + 86 = 0 Reorder the terms: 86 + 28x + 391x2 = 0 Solving 86 + 28x + 391x2 = 0 Solving for variable 'x'. Begin completing the square. Divide all terms by 391 the coefficient of the squared term: Divide each side by '391'. 0.2199488491 + 0.0716112532x + x2 = 0 Move the constant term to the right: Add '-0.2199488491' to each side of the equation. 0.2199488491 + 0.0716112532x + -0.2199488491 + x2 = 0 + -0.2199488491 Reorder the terms: 0.2199488491 + -0.2199488491 + 0.0716112532x + x2 = 0 + -0.2199488491 Combine like terms: 0.2199488491 + -0.2199488491 = 0.0000000000 0.0000000000 + 0.0716112532x + x2 = 0 + -0.2199488491 0.0716112532x + x2 = 0 + -0.2199488491 Combine like terms: 0 + -0.2199488491 = -0.2199488491 0.0716112532x + x2 = -0.2199488491 The x term is 0.0716112532x. Take half its coefficient (0.0358056266). Square it (0.001282042896) and add it to both sides. Add '0.001282042896' to each side of the equation. 0.0716112532x + 0.001282042896 + x2 = -0.2199488491 + 0.001282042896 Reorder the terms: 0.001282042896 + 0.0716112532x + x2 = -0.2199488491 + 0.001282042896 Combine like terms: -0.2199488491 + 0.001282042896 = -0.218666806204 0.001282042896 + 0.0716112532x + x2 = -0.218666806204 Factor a perfect square on the left side: (x + 0.0358056266)(x + 0.0358056266) = -0.218666806204 Can't calculate square root of the right side. The solution to this equation could not be determined.
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