What's an example of a function with a graph that lies entirely below the x-axis?

Answer 1

Best Answer - Chosen by Asker

Hello

Another example is a parabola opening down with its summit below the x-axis

here : -x² + 2x - 2

http://img98.imageshack.us/img98/2932/pa…

Hope it helps

Bye !

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Asker's Comment:

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Answer 2

f(x) = -5.

This is a constant function, where for each x value, the function evaluated at x is the number -5.
This is below the x-axis because -5 < 0.

Answer 3

it means that the value of function is always negative..
f(x)=k , where k < 0
others are
f(x)=log(x-[x]), where x is not an integer and [x] denotes greatest integer less than or equal to x.
or
f(x)=-e^x