Question 4 of 10 Multiple Choice:  Please select the best answer and click "submit." Let  f ( x ) = -2 x  + 1 and  x 1  and  x 2  be any constants in   that satisfy the condition  x 1  <  x 2 . What do you need to show to prove  f  is decreasing on  ? A . f ( x 1 ) >  f ( x 2 ) B . f (2) >  f (4) C . f (2) <  f (4) D . f ( x 1 ) <  f ( x 2 ) E . f  is actually increasing .

1. Question 4 of 10
Multiple Choice:
Please select the best answer and click "submit."
Let
f
(
x
) = -2
x
+ 1 and
x
1
and
x
2
be any constants in
that satisfy the condition
x
1
<
x
2
. What do you need to show to prove
f
is decreasing on
?
A
.
f
(
x
1
) >
f

2. (
x
2
)
B
.
f
(2) >
f
(4)
C
.
f
(2) <
f
(4)
D
.
f
(
x
1
) <
f
(
x
2
)
E
.
f
is actually increasing