Question

using suitable identities find (2A + 9 )and (2A + 9)​

Answer 1

using identity– a²+2ab+b²

(2a+9)²=(2a)² + 2×2a×9 + (9)²

=4a²+36a+81

Answer 2

Answer:

Hello!! Your answer is  4A²+36A+81

Step-by-step explanation:

There are two methods by which we can solve this equation :-

1. (a+b)²

2. Middle-term  [(x+a) (x+b) = x²+(a+b)x+(ab)]

Method 1:

    (2A+9) (2A+9)

⇒ (2A)²+ 2(2A)(9) + (9)²

= 4A²+36A+81

Method 2:

    (2A+9) (2A+9)

⇒ (2A)² + (9+9)2A + (9)(9)

= 4A²+36A+81

                                           Hope, it will help you....