Question

Expand the following (6x+2y-z)2

Answer 1

Answer:

formula

(x+y+z)^2=x^2+y^2+z^2+2x*y+2y*z+2z*x

(6x+2y-z) ^2

=(6x) ^2+(2y) ^2+(-z) ^2+(2*6x*2y)+(2*2y*-z) +(2*-z*6x)

=36x^2+4y^2+z^2+24x*y-4yz-12xz (ans)...