Question

expand (y+z-3x)^2 please tell ​

Answer 1

Answer:

(A+B+C)²=A²+B²+C²=2AB+2BC+2CA

Substituting, A=y, B=z and C=(-3x),

(y+z+(-3x))²=y²+z²(-3x)²+2yz+2z(-3x)+2(-3x)y

⇒ (y+z+(-3x))²=y²+z²+9x²+2yz-6xz-6xy

hope it helps u......