Question

CMR (a-b+c)-(a+c) =-b

Answer 1

(a - b + c) - (a + c) 

= a - b + c - a - c

= (a - a) - b + (c - c)

= 0 - b + 0

= -b

Answer 2

VT=a-b+c-a-c=-b=VP