Question

Expand by suitable identities-
(4x5+y4)(4x5+y4)​

Answer 1

Answer:

400+20y^4+y^8

Step-by-step explanation:

4×5=20

(20+y^4)(20+y^4) = (20+y^4)²

Using identity (x+y)²=x²+2xy+y²

Here x=20, y=y^4

∴(20+y^4)² = (20)² + (20×y^4) + (y^4)²

                  = 400 + 20y^4 + y^8