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Simplifying (a + 7)(a + -9) = 0 Reorder the terms: (7 + a)(a + -9) = 0 Reorder the terms: (7 + a)(-9 + a) = 0 Multiply (7 + a) * (-9 + a) (7(-9 + a) + a(-9 + a)) = 0 ((-9 * 7 + a * 7) + a(-9 + a)) = 0 ((-63 + 7a) + a(-9 + a)) = 0 (-63 + 7a + (-9 * a + a * a)) = 0 (-63 + 7a + (-9a + a2)) = 0 Combine like terms: 7a + -9a = -2a (-63 + -2a + a2) = 0 Solving -63 + -2a + a2 = 0 Solving for variable 'a'. Factor a trinomial. (-7 + -1a)(9 + -1a) = 0Subproblem 1
Set the factor '(-7 + -1a)' equal to zero and attempt to solve: Simplifying -7 + -1a = 0 Solving -7 + -1a = 0 Move all terms containing a to the left, all other terms to the right. Add '7' to each side of the equation. -7 + 7 + -1a = 0 + 7 Combine like terms: -7 + 7 = 0 0 + -1a = 0 + 7 -1a = 0 + 7 Combine like terms: 0 + 7 = 7 -1a = 7 Divide each side by '-1'. a = -7 Simplifying a = -7Subproblem 2
Set the factor '(9 + -1a)' equal to zero and attempt to solve: Simplifying 9 + -1a = 0 Solving 9 + -1a = 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 + -1a = 0 + -9 Combine like terms: 9 + -9 = 0 0 + -1a = 0 + -9 -1a = 0 + -9 Combine like terms: 0 + -9 = -9 -1a = -9 Divide each side by '-1'. a = 9 Simplifying a = 9Solution
a = {-7, 9}
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