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Simplifying (a + 3)(2a + -1) = 15 Reorder the terms: (3 + a)(2a + -1) = 15 Reorder the terms: (3 + a)(-1 + 2a) = 15 Multiply (3 + a) * (-1 + 2a) (3(-1 + 2a) + a(-1 + 2a)) = 15 ((-1 * 3 + 2a * 3) + a(-1 + 2a)) = 15 ((-3 + 6a) + a(-1 + 2a)) = 15 (-3 + 6a + (-1 * a + 2a * a)) = 15 (-3 + 6a + (-1a + 2a2)) = 15 Combine like terms: 6a + -1a = 5a (-3 + 5a + 2a2) = 15 Solving -3 + 5a + 2a2 = 15 Solving for variable 'a'. Reorder the terms: -3 + -15 + 5a + 2a2 = 15 + -15 Combine like terms: -3 + -15 = -18 -18 + 5a + 2a2 = 15 + -15 Combine like terms: 15 + -15 = 0 -18 + 5a + 2a2 = 0 Factor a trinomial. (-9 + -2a)(2 + -1a) = 0Subproblem 1
Set the factor '(-9 + -2a)' equal to zero and attempt to solve: Simplifying -9 + -2a = 0 Solving -9 + -2a = 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 + -2a = 0 + 9 Combine like terms: -9 + 9 = 0 0 + -2a = 0 + 9 -2a = 0 + 9 Combine like terms: 0 + 9 = 9 -2a = 9 Divide each side by '-2'. a = -4.5 Simplifying a = -4.5Subproblem 2
Set the factor '(2 + -1a)' equal to zero and attempt to solve: Simplifying 2 + -1a = 0 Solving 2 + -1a = 0 Move all terms containing a to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + -1a = 0 + -2 Combine like terms: 2 + -2 = 0 0 + -1a = 0 + -2 -1a = 0 + -2 Combine like terms: 0 + -2 = -2 -1a = -2 Divide each side by '-1'. a = 2 Simplifying a = 2Solution
a = {-4.5, 2}
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