Question

9. (x + y)2 + 2(x + y) + 1 is equivalent to
(a) (x + y - 1)(x + y + 1)
(C) (x - y - 1)(x + y + 1)
(6) (x – y + 1)(x + y + 1)
(d)(x + y + 1)(x + y + 1)​

Answer 1

Answer:

9. (x + y)2 + 2(x + y) + 1

let x + y = t

therefore t2 + 2t + 1

= (t + 1)2

= (t + 1) (t + 1)

put the value of t in above step

so, we got

= (x + y + 1) (x + y + 1)