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Math Help - Slope Intercept Form

  1. #1
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    Unhappy Slope Intercept Form

    I had a bad pre-algebra teacher in 7th grade, and she just talked on while making us write down notes that we wouldn't remember while trying to listen to her, and I didn't understand it when I looked at the section on NCVPS, or when my Algebra 1 teacher went over it in class.

    f(x) = -2x + 5, and g(x) = x^2 - 4x + 1. Find the given Values.

    1. f(1/2)
    2. g(-2)

    Please solve, and explain. Thank you for your time.
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  2. #2
    Forum Admin topsquark's Avatar
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    Quote Originally Posted by Epidemic Proportions View Post
    I had a bad pre-algebra teacher in 7th grade, and she just talked on while making us write down notes that we wouldn't remember while trying to listen to her, and I didn't understand it when I looked at the section on NCVPS, or when my Algebra 1 teacher went over it in class.

    f(x) = -2x + 5, and g(x) = x^2 - 4x + 1. Find the given Values.

    1. f(1/2)
    2. g(-2)

    Please solve, and explain. Thank you for your time.
    What does this have to do with "slope-intercept form???"

    I'll do the first, you do the second.

    You've got f \left ( \frac{1}{2} \right ). What this means is, wherever we see an "x" in the definition of the function you put a 1/2, so
    f \left ( \frac{1}{2} \right ) = -2 \left ( \frac{1}{2} \right ) + 5 = -1 + 5 = 4.

    -Dan
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  3. #3
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    g(x) = x^2 - 4x + 1

    So if g(2) = 4 - 8 + 1 = - 3?


    Also, Sorry if it didnt have to do much with slope intercept, but didn't understand what I was doing at all, even if it was easier than it looked. It did have to do with Linear equations right?
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  4. #4
    Forum Admin topsquark's Avatar
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    Quote Originally Posted by Epidemic Proportions View Post
    g(x) = x^2 - 4x + 1

    So if g(2) = 4 - 8 + 1 = - 3?


    Also, Sorry if it didnt have to do much with slope intercept, but didn't understand what I was doing at all, even if it was easier than it looked. It did have to do with Linear equations right?
    You got it right!

    It had more to do with linear functions, not equations. But there's no need to worry over the label too much, either.

    -Dan
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  5. #5
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    Quote Originally Posted by Epidemic Proportions View Post
    I had a bad pre-algebra teacher in 7th grade, and she just talked on while making us write down notes that we wouldn't remember while trying to listen to her, and I didn't understand it when I looked at the section on NCVPS, or when my Algebra 1 teacher went over it in class.

    f(x) = -2x + 5, and g(x) = x^2 - 4x + 1. Find the given Values.

    1. f(1/2)
    2. g(-2)

    Please solve, and explain. Thank you for your time.
    Quote Originally Posted by topsquark View Post
    What does this have to do with "slope-intercept form???"

    [snip]
    -Dan
    Aww come on topsquark - give the guy a break. S/he "had a bad pre-algebra teacher in 7th grade" .....
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