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Simplifying (a + b)(a + -2b) = -9 Multiply (a + b) * (a + -2b) (a(a + -2b) + b(a + -2b)) = -9 ((a * a + -2b * a) + b(a + -2b)) = -9 Reorder the terms: ((-2ab + a2) + b(a + -2b)) = -9 ((-2ab + a2) + b(a + -2b)) = -9 (-2ab + a2 + (a * b + -2b * b)) = -9 (-2ab + a2 + (ab + -2b2)) = -9 Reorder the terms: (-2ab + ab + a2 + -2b2) = -9 Combine like terms: -2ab + ab = -1ab (-1ab + a2 + -2b2) = -9 Solving -1ab + a2 + -2b2 = -9 Solving for variable 'a'. Reorder the terms: 9 + -1ab + a2 + -2b2 = -9 + 9 Combine like terms: -9 + 9 = 0 9 + -1ab + a2 + -2b2 = 0 The solution to this equation could not be determined.
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