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Simplifying 2a2 + -1a + 9 = 0 Reorder the terms: 9 + -1a + 2a2 = 0 Solving 9 + -1a + 2a2 = 0 Solving for variable 'a'. Begin completing the square. Divide all terms by 2 the coefficient of the squared term: Divide each side by '2'. 4.5 + -0.5a + a2 = 0 Move the constant term to the right: Add '-4.5' to each side of the equation. 4.5 + -0.5a + -4.5 + a2 = 0 + -4.5 Reorder the terms: 4.5 + -4.5 + -0.5a + a2 = 0 + -4.5 Combine like terms: 4.5 + -4.5 = 0.0 0.0 + -0.5a + a2 = 0 + -4.5 -0.5a + a2 = 0 + -4.5 Combine like terms: 0 + -4.5 = -4.5 -0.5a + a2 = -4.5 The a term is -0.5a. 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. -0.5a + 0.0625 + a2 = -4.5 + 0.0625 Reorder the terms: 0.0625 + -0.5a + a2 = -4.5 + 0.0625 Combine like terms: -4.5 + 0.0625 = -4.4375 0.0625 + -0.5a + a2 = -4.4375 Factor a perfect square on the left side: (a + -0.25)(a + -0.25) = -4.4375 Can't calculate square root of the right side. The solution to this equation could not be determined.
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