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Simplifying (a + 9)(a + 1) = 0 Reorder the terms: (9 + a)(a + 1) = 0 Reorder the terms: (9 + a)(1 + a) = 0 Multiply (9 + a) * (1 + a) (9(1 + a) + a(1 + a)) = 0 ((1 * 9 + a * 9) + a(1 + a)) = 0 ((9 + 9a) + a(1 + a)) = 0 (9 + 9a + (1 * a + a * a)) = 0 (9 + 9a + (1a + a2)) = 0 Combine like terms: 9a + 1a = 10a (9 + 10a + a2) = 0 Solving 9 + 10a + a2 = 0 Solving for variable 'a'. Factor a trinomial. (9 + a)(1 + a) = 0Subproblem 1
Set the factor '(9 + a)' equal to zero and attempt to solve: Simplifying 9 + a = 0 Solving 9 + a = 0 Move all terms containing a to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + a = 0 + -9 Combine like terms: 9 + -9 = 0 0 + a = 0 + -9 a = 0 + -9 Combine like terms: 0 + -9 = -9 a = -9 Simplifying a = -9Subproblem 2
Set the factor '(1 + a)' equal to zero and attempt to solve: Simplifying 1 + a = 0 Solving 1 + a = 0 Move all terms containing a to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + a = 0 + -1 Combine like terms: 1 + -1 = 0 0 + a = 0 + -1 a = 0 + -1 Combine like terms: 0 + -1 = -1 a = -1 Simplifying a = -1Solution
a = {-9, -1}
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