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If the function f(x)=2x^2-k x+5 is incre...

If the function `f(x)=2x^2-k x+5` is increasing on `[1,\ 2]` , then `k` lies in the interval (a) `(-oo,\ 4)` (b) `(4,\ oo)` (c) `(-oo,\ 8)` (d) `(8,\ oo)`

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RD SHARMA ENGLISH-INCREASING AND DECREASING FUNCTION -All Questions
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  3. If the function f(x)=2x^2-k x+5 is increasing on [1,\ 2] , then k lies...

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  20. The function f(x)=x/(1+|x|) is (a) strictly increasing (b) strictly...

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