Question

(a+1) (a-9)
expand the expression

Answer 1

The answer is a²–8a–9

Step-by-step explanation:

$(a + 1)(a - 9) \\ a(a - 9) + 1(a - 9) \\ {a}^{2} - 9a + a - 9 \\ {a}^{2} - 8a - 9$