Question

Simplify {(a^2+10a+21) +(a^2+6a-7) }*{(a^2-1) +(a+3) }(3)​

Answer 1

Answer:

1

Step-by-step explanation:

(a

2

+6a−7)

(a

2

+10a+21)

×

(a+3)

(a

−

1)

⇒

(a−1)+(a+7)

(a+3)(a+7)

×

(a+3)

(a−1)(a+1)

⇒1.