(a - 1)(2a + 3) = a * 2a + a * 3 - 1 * 2a - 1 * 3 = 2a² + 3a -2a - 3 = 2a² + a - 3
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(a - 1)(2a + 3) = a * 2a + a * 3 - 1 * 2a - 1 * 3 = 2a² + 3a -2a - 3 = 2a² + a - 3