Question

Expand (x + 2y + 4 z)?​

Answer 1

Answer:

We need to expand (x+2y+4z)²

We know appropriate identity (x+y+z)2=x²+y²+z²+2xy+2yz+2xz

Therefore, the value of (x+2y+4z)2 is

=x²+(2y)²+(4z)²+2(x)(2y)+2(2y)(4z)+2(x)(4z)

=x²+4y²+16z²+4xy+16yz+8xz