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Thread: Algebra Homework help

  1. #1
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    Algebra Homework help

    I'm working on a worksheet assigned in class, and I'm completely stumped about one problem.

    My teacher never went over anything like this, and there's no a single example in my entire book of how to do this problem.

    So now this is my last resort. I've uploaded an image of the problem, and I hope someone can help.

    The problems with just "Find F(5)" on the graph are really simple. However, I've never seen or dealt with one like this and I don't even know where to start.
    Attached Thumbnails Attached Thumbnails Algebra Homework help-soconfused.jpg  
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  2. #2
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    $\displaystyle f(5)$

    $\displaystyle x=5$, look at the graph and you'll see that $\displaystyle y=-2\,\therefore\,f(5)=-2$

    Well, to get the desired, follow the same method, not hard.
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  3. #3
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    I understand that, but again, the problem there is different.

    What do I do when they throw in addition and multiplication to the same problem?

    I already have a million examples of F(5). I have no examples of the problem I'm shown.

    I'm just not seeing it.
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  4. #4
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    So, what's the matter?

    Just look at $\displaystyle f(4)$ and $\displaystyle f(1)$, when you get them, just set $\displaystyle f(4)+3\cdot f(1)$

    It's simple, there's nothing to worry about.
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  5. #5
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    I'm still confused...

    How do you add points on a graph?

    Okay, this is what I get.

    f(4) = 1
    f(1) = -2

    How do I plug this in? What does the three have to do with anything?

    Would it just be 1 * 3(-2)?
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  6. #6
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    $\displaystyle f(4)+3\cdot f(1)=1+3\cdot(-2)=1-6=-5$
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  7. #7
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    Ah, I see. I wasn't thinking that's how it worked. Thanks.
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