Question

8) 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) =

J) (x-4y) × (x-y)=

L) (3x+1) × (3x-1)=

M) (2x+5) × ( 2x-5) =
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Answer 1

A) 3 (x-y) =3x-3y

B) 7 (x-2y) =7x-14y

C) 2x (x+y)=2x²+2xy

D) 4x (a+b)=4ax+4bx

E) 2x (x²-2x+5) =2x³-4x²+10x

F) (x-5) × (x-2) =x²-7x+10

G) (3x+2) × (2x+1) =6x²+3x+4x+2=6x²+7x+2

H) (x+7) × (x-4) =x²+3x-12

I) (3x+4) × (2x-1) =6x²-3x+8x-4=6x²+5x-4

J) (x-4y) × (x-y)=x²-xy-4xy+4y²=x²-5xy+4y²

L) (3x+1) × (3x-1)=9x²-1

M) (2x+5) × ( 2x-5) =4x²-25