Question

Номер 578 (только б,г,е)

Answer 1

$2) {a}^{2} - 4a + a - 4 = {a}^{2} - 3a - 4 \\ 4)2 {a}^{2} - 8a + a - 4 = 2 {a }^{2} - 7a - 4 \\ 6)20x - 12 - 15 {x }^{2} + 9x = \\ - 15 {x}^{2} + 29x - 12$