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    I got some definitions that may be useful. But I'm not sure how to start solving the question. Should I substitute the definitions in or what?

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    (Original post by Airess3)
    I got some definitions that may be useful. But I'm not sure how to start solving the question. Should I substitute the definitions in or what?

    Name:  Screenshot 2018-02-18 17.15.38.png
Views: 11
Size:  89.7 KB

    Attachment 726004726006

    You need none of “the definitions” that you have in the second picture. You only need

    A)2 = <(A − <A>)2>

    Expand (A − <A>)2 and then apply <> to each term.
 
 
 
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