Question

Sendo A=a+b-c, B=a-b-c e C=a-b+c, determine:

a)A-B b)A-B-C

Answer 1

Boa tarde

A = a + b - c
B = a - b - c
C = a - b + c

a)

A - B = a + b - c - a + b + c = 2b

b)

A - B - C = a + b + c - a + b + c - a + b - c = -a + 3b + c