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Simplifying 2w2 + -1w + 78 = 0 Reorder the terms: 78 + -1w + 2w2 = 0 Solving 78 + -1w + 2w2 = 0 Solving for variable 'w'. Begin completing the square. Divide all terms by 2 the coefficient of the squared term: Divide each side by '2'. 39 + -0.5w + w2 = 0 Move the constant term to the right: Add '-39' to each side of the equation. 39 + -0.5w + -39 + w2 = 0 + -39 Reorder the terms: 39 + -39 + -0.5w + w2 = 0 + -39 Combine like terms: 39 + -39 = 0 0 + -0.5w + w2 = 0 + -39 -0.5w + w2 = 0 + -39 Combine like terms: 0 + -39 = -39 -0.5w + w2 = -39 The w term is -0.5w. Take half its coefficient (-0.25). Square it (0.0625) and add it to both sides. Add '0.0625' to each side of the equation. -0.5w + 0.0625 + w2 = -39 + 0.0625 Reorder the terms: 0.0625 + -0.5w + w2 = -39 + 0.0625 Combine like terms: -39 + 0.0625 = -38.9375 0.0625 + -0.5w + w2 = -38.9375 Factor a perfect square on the left side: (w + -0.25)(w + -0.25) = -38.9375 Can't calculate square root of the right side. The solution to this equation could not be determined.
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