Question

1) aplique a propriedade distributiva e efetue quando possível.

A) 2. (a + b) =

B) 8. (2 - x) =

C) 12. {½ + ¾} =

D) (-2x) . {5-x/2} =

Answer 1

A) 2. (a + b) =

2. (a + b) =
2a+2b

B) 8. (2 - x) =

8. (2 - x) =
16-8x=
-8x=-16
x=16/8
x=2

C) 12. {½ + ¾} =
12/6+36/4=
6+9= 15


D) (-2x) . {5-x/2} =

(-2x) . {5-x/2}
-10x+2x²/2=
-10x+x²=
x(-10+x)=

 Para raízes x'e x"
1) x'
x'=0

2) x"
-10+x=0
x=10

x"=10