# Some Algerba problems

• Apr 26th 2009, 03:25 PM
Lespaul1216
Some Algerba problems
Hi guys, I want to make sure that I did these problems on my study guide correctly.My final is tomorrow and I want to know I did this right.

14)if f(x) = 2x/5x-3, then f(2) is equal to:

a.2/3
b.3/4
c.1/2
d.3/5
e.-3/5

15.if f(x)= 2x^2-3 and g(x)= -x+5, then (fog)(x)=
a.-2x^2+20x+47
b.-2x^2-20x+47
c.2x^2-20x-47
d.2x^2-20x+47
e.-2x^2-20x-47

17.the function y= -x^2+IxI is:
a.odd
b.even
c.both odd and even
d.neither odd nor even
e.not symmetric with respect to the x-axis, y-axis, or the origin.
• Apr 26th 2009, 03:41 PM
stapel
14) Plug "2" in for "x". Simplify. What do you get?

15) Plug "g" (that is, "-x + 5") in for "x" in "f" (that is, in place of "x" in "2x^2 - 3"). Simplify. What do you get?

16) Follow the rules they gave you in the book, comparing f(-x), -f(x), and f(x). What do you get? What do you conclude?

Please be complete. Thank you! :D
• Apr 26th 2009, 03:51 PM
Lespaul1216
I came here because I need help.I have a very low C, I'm no good at math.14)B, 15)C, 17)A. I know my answers are wrong.I need help.
• Apr 27th 2009, 02:14 AM
mr fantastic
Quote:

Originally Posted by Lespaul1216
I came here because I need help.I have a very low C, I'm no good at math.14)B, 15)C, 17)A. I know my answers are wrong.I need help.

You have been told how to do them in post #2.