Question

find the cube 2a-b-c​

Answer 1

Answer:

4a²+b²+c²-2(2ab-bc+2ac)

step by step explanation

(2a-b-c)²

(2a)²+(-b)²+(-c)²+2×2a×(-b)+2×(-b)×(-c)+2×(-c)×2a

=4a²+b²+c²-4ab+2bc-4ac

=4a²+b²+c²-2(2ab-bc+2ac)