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Math Help - Some Algerba problems

  1. #1
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    Exclamation 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.
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  2. #2
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    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!
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  3. #3
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    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.
    Last edited by mr fantastic; April 27th 2009 at 03:15 AM. Reason: Modified language
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  4. #4
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    Quote Originally Posted by Lespaul1216 View Post
    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.

    It is reasonable to ask what answers you got. You are asked this in the expectation that you will also give reasons for your answers so that your difficulties can be better diagnosed and addressed.
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