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Math Help - x and y intercepts

  1. #1
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    x and y intercepts

    Can someone help me find x intercept for

    f(x) = 1 - 3(-x-2)2
    (the last 2 means square, not sure how to do upper case here)

    I have been stuck with this one for couple of hours.


    Thanks everyone. This is my first post I am glad I found some on-line help.
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  2. #2
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    Hello,

    Quote Originally Posted by zdenka View Post
    Can someone help me find x intercept for

    f(x) = 1 - 3(-x-2)2
    (the last 2 means square, not sure how to do upper case here)

    I have been stuck with this one for couple of hours.


    Thanks everyone. This is my first post I am glad I found some on-line help.
    An y intercept is a point where x=0.

    f(0)=1-3(-0-2)^2=1-3(-2)^2=1-3 \cdot 4=-11
    So the point (0~,~-11) is an y intercept.


    An x intercept is a point where y=0.

    1-3(-x-2)^2=0

    -3(-(x+2))^2=-1

    (x+2)^2=\frac 13

    \implies x+2=\pm \frac{1}{\sqrt{3}}
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  3. #3
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    thank you that looks great. I got stuck on the last line!!!
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