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Math Help - strictly decreasing

  1. #1
    Junior Member ibnashraf's Avatar
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    strictly decreasing

    Question: Which of the following functions is strictly decreasing for x\in\Re?

    (a) f(x)=x^2

    (b) f(x)=-x

    (c) f(x)=\sqrt{x}

    (d) f(x)=2-x^2
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  2. #2
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    Quote Originally Posted by ibnashraf View Post
    Question: Which of the following functions is strictly decreasing for x\in\Re?

    (a) f(x)=x^2

    (b) f(x)=-x

    (c) f(x)=\sqrt{x}

    (d) f(x)=2-x^2
    did you look at the graphs of these functions?
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  3. #3
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    The answer is (b), f(x)=-x ... but if you don't understand this I think you need to invest time into understanding the graphs and what it means to have a decreasing function...
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