Question

Expand each of the following using suitable identity (3a-7b-c)2

Answer 1

Answer:

(3a-7b-c)²

= 9a²+49b²+c²-42ab+14bc-6ac

hope it helps u......^_^

Answer 2

Answer:

( 3a-7b-c)

(x+y+z)^2 = x^2+y^2+z^2+2xy+2yz+2zx

x= 3a , y= -7 b , z= -c

(3a)^2+(-7b)^2+(-c)^2+2(3a)(-7b)+2(7b)(-c)+2(-c)(3a)

9a^2+49b^2+c^2-42ab+14bc-6ac

Have a great day