Question

1)Calcule os produtos:
a) 3.(x+y)=
b) 7.(x-2y)=
c) 2x.(x+y)=
d) 4x. (a+b)=
e) 2x.(x²-2x+5)=
f) (x+5).(x+2)=
g) (3x+2).(2x+1)=
h) (x+7).(x-4) =
i) (3x+4).(2x-1) =

Answer 1

Resposta:

1) a) 3.(x+y)=

3x + 3y

b) 7.(x-2y)=

7x - 14y

c) 2x.(x+y)=

2x² + 2y

d) 4x. (a+b)=

4xa + 4xb

e) 2x.(x²-2x+5)=

2x³ - 4x² + 5

f) (x+5).(x+2)=

x² + 2x + 5x + 4=

x² + 7x + 4

g) (3x+2).(2x+1)=

6x² + 3x + 4x + 2=

6x² + 7x + 2

h) (x+7).(x-4) =

x² + 4x + 7x - 28=

x² + 11x - 28

i) (3x+4).(2x-1) =

6x² - 3x + 8x - 4=

6x² +5x - 4