Question

expand (a+2) (a-1). ​

Answer 1

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

Answer 2

Answer:

a^2 +a -2

Step-by-step explanation:

(a +2) (a -1)

(a)^2 + ( 2 -1) a + (2) (-1) (a +x) (a +y) = (a)^2 + ( x+y)a + (x)(y)

a^2 + (1) a +(-2)

a^2 +a -2