Question

Expand (3a-7b-c) ​ 2

Answer 1

(3a-7b-c)²
=[3a-(7b+c)]²
=9a²-2.3a(7b+c)+(7b+c)²
=9a²-42ab-6ac+49b²+2.7b.c+c²
=9a²+49b²+c²-42ab-6ac+14bc

Answer 2

Answer:(3a-7b-c)^2=

Step-by-step explanation: