Question

4) Sendo,


A = x - 2y

B = 2x + y

C = y + 3


Calcule:


a) A + B

b) B ­- C

c) A . C

Answer 1

Oiee,

a)
x - 2y + (2x + y )
x - 2y + 2x + y
3x - y

b)
2x + y - (y + 3)
2x + y - y - 3
2x - 3

c)
(x - 2y ) × (y + 3 )
xy + 3x - 2y² - 6y

Answer 2

a
A+B = x-2y+2x+y = 3x-y
b
B-C = 2x+y-(y+3) = 2x+y-y-3 = 2x-3
c
A.C = (x-2y).(y+3) = xy+3x-2y^2-6y