Question

(x - 2y + 3z)^2
expand the following ​

Answer 1

(x-2y+3z) ²=(x)²+(-2y) ²+(3z)² +2(x) (-2y) +2(-2y) (3z) + 2(3z) (x)

x²+4y²+9z² −4xy−12yz+6xz