Question

(1) (a +2)(a - 1) practice set 5.1​

Answer 1

Answer:

a^2 + a - 2

Step-by-step explanation:

We will use this identity :-

(x + y) (x + z) = x^2 + (y + z)x + yz

Here, x = a, y = 2 & z = -1

So, (a + 2) (a - 1)

= a^2 + (-1 + 2)a + 2 × -1

= a^2 + a - 2