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Simplifying (4a + 5)(a + 7) = 0 Reorder the terms: (5 + 4a)(a + 7) = 0 Reorder the terms: (5 + 4a)(7 + a) = 0 Multiply (5 + 4a) * (7 + a) (5(7 + a) + 4a * (7 + a)) = 0 ((7 * 5 + a * 5) + 4a * (7 + a)) = 0 ((35 + 5a) + 4a * (7 + a)) = 0 (35 + 5a + (7 * 4a + a * 4a)) = 0 (35 + 5a + (28a + 4a2)) = 0 Combine like terms: 5a + 28a = 33a (35 + 33a + 4a2) = 0 Solving 35 + 33a + 4a2 = 0 Solving for variable 'a'. Factor a trinomial. (7 + a)(5 + 4a) = 0Subproblem 1
Set the factor '(7 + a)' equal to zero and attempt to solve: Simplifying 7 + a = 0 Solving 7 + a = 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 + a = 0 + -7 Combine like terms: 7 + -7 = 0 0 + a = 0 + -7 a = 0 + -7 Combine like terms: 0 + -7 = -7 a = -7 Simplifying a = -7Subproblem 2
Set the factor '(5 + 4a)' equal to zero and attempt to solve: Simplifying 5 + 4a = 0 Solving 5 + 4a = 0 Move all terms containing a to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + 4a = 0 + -5 Combine like terms: 5 + -5 = 0 0 + 4a = 0 + -5 4a = 0 + -5 Combine like terms: 0 + -5 = -5 4a = -5 Divide each side by '4'. a = -1.25 Simplifying a = -1.25Solution
a = {-7, -1.25}
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