Question

Expand using identities
( 2x + y + z)^2

Answer 1

Answer:

Identity : (a+b+c)²=a²+b²+c²+2(ab+bc+ac)

so (2x+y+z)²= 4x²+y²+z²+2(2xy+yz+2xz)=

4x²+y²+z²+4xy+2yz+4xz