Question

sendo
a=x-2y
b=2x+y
c=y+3
calcule:
a)A+B
b)B-C
c)A.C

Answer 1

a) x-2y+2x+y = 3x-Y

b) 2x+y-Y+3 = 2x+3

c) (x-2y).(y+3) = xy+3x-2x²-6y = -2x²+3x+xy-6y