Question

Expand the following : (i) ( 4a – 2b + 3c )² (ii) ( 5m – 7 )³

Answer 1

Answer:

1) (4a-2b +3c)²

(4a +(-2b) + (3c))²

using (x+y+z)²=2xy+2yz+2zx

so,x=4a, y =-2b ,z=- 3c

= (4a)² +(-2b)² +(-3c)² +2(4a)(-2b) +2(-2b)(3c) +2(3c)(4a)

16a²+4b²+9c²-16ab+12bc-24ac.