Question

(a+7)(a-1)+(a-3)во 2 степени

Answer 1

$(a + 7)(a + 1) + {(a + 3)}^{2} = {a}^{2} + a + 7a + 7 + {a}^{2} + 6a + 9 = 2 {a}^{2} + 14a + 16$