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Simplifying 2d2 + -5d + 4 = 0 Reorder the terms: 4 + -5d + 2d2 = 0 Solving 4 + -5d + 2d2 = 0 Solving for variable 'd'. Begin completing the square. Divide all terms by 2 the coefficient of the squared term: Divide each side by '2'. 2 + -2.5d + d2 = 0 Move the constant term to the right: Add '-2' to each side of the equation. 2 + -2.5d + -2 + d2 = 0 + -2 Reorder the terms: 2 + -2 + -2.5d + d2 = 0 + -2 Combine like terms: 2 + -2 = 0 0 + -2.5d + d2 = 0 + -2 -2.5d + d2 = 0 + -2 Combine like terms: 0 + -2 = -2 -2.5d + d2 = -2 The d term is -2.5d. Take half its coefficient (-1.25). Square it (1.5625) and add it to both sides. Add '1.5625' to each side of the equation. -2.5d + 1.5625 + d2 = -2 + 1.5625 Reorder the terms: 1.5625 + -2.5d + d2 = -2 + 1.5625 Combine like terms: -2 + 1.5625 = -0.4375 1.5625 + -2.5d + d2 = -0.4375 Factor a perfect square on the left side: (d + -1.25)(d + -1.25) = -0.4375 Can't calculate square root of the right side. The solution to this equation could not be determined.
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