Question

expand (2a+8b-4c)^2 .

Answer 1

Answer:

(x+y+z)² =x  ²+y  ²  +z ² +2xy+2yz+2zx        [Identity]

Here,  

x=2a

y=3b

z=4c

Putting Values in Identity, We get :

⇒ (2a+3b+4c) ²

=(2a)  ²+(3b)  ² +(4c)  ²  +2(2a)(3b)+2(3b)(4c)+2(4c)(2a)

=4a  ² +9b  ²  +16c²  +12ab+24bc+16ca