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Math Help - just starting a maths course little rusty

  1. #1
    Junior Member
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    just starting a maths course little rusty

    If c = -7 and d= 4 what answear do you get for
    root(d)-dc^2
    after evaluating the expression i was un sure if it was 198 or -194 if someone could please give us a brief explaination to why it was that one it would be a greet help

    thanks
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  2. #2
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    Re: just starting a maths course little rusty

    Quote Originally Posted by Orlando View Post
    If c = -7 and d= 4 what answear do you get for
    root(d)-dc^2
    after evaluating the expression i was un sure if it was 198 or -194 if someone could please give us a brief explaination to why it was that one it would be a greet help
    -194 is correct: because -7^2 = -7 * -7 = +49
    sqrt(d) = 2
    dc^2 = 4 * 49 = 196
    2 - 196 = -194 ; roger.
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