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Simplifying 25x2 + -80x + 72 = 0 Reorder the terms: 72 + -80x + 25x2 = 0 Solving 72 + -80x + 25x2 = 0 Solving for variable 'x'. Begin completing the square. Divide all terms by 25 the coefficient of the squared term: Divide each side by '25'. 2.88 + -3.2x + x2 = 0 Move the constant term to the right: Add '-2.88' to each side of the equation. 2.88 + -3.2x + -2.88 + x2 = 0 + -2.88 Reorder the terms: 2.88 + -2.88 + -3.2x + x2 = 0 + -2.88 Combine like terms: 2.88 + -2.88 = 0.00 0.00 + -3.2x + x2 = 0 + -2.88 -3.2x + x2 = 0 + -2.88 Combine like terms: 0 + -2.88 = -2.88 -3.2x + x2 = -2.88 The x term is -3.2x. Take half its coefficient (-1.6). Square it (2.56) and add it to both sides. Add '2.56' to each side of the equation. -3.2x + 2.56 + x2 = -2.88 + 2.56 Reorder the terms: 2.56 + -3.2x + x2 = -2.88 + 2.56 Combine like terms: -2.88 + 2.56 = -0.32 2.56 + -3.2x + x2 = -0.32 Factor a perfect square on the left side: (x + -1.6)(x + -1.6) = -0.32 Can't calculate square root of the right side. The solution to this equation could not be determined.
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