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# Decreasing and increasing function

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1. Hi, when showing that f(x) is decreasing for all values of x . Do you just say f'(x) <0 and (equation )< ( less than or equal to )0?
For increasing function do you just say f'(x) >0 and (equation )> (and equal to ) -1?
This question is an example thanks.
2. (Original post by coconut64)
Hi, when showing that f(x) is decreasing for all values of x . Do you just say f'(x) <0 and (equation )< ( less than or equal to )0?
For increasing function do you just say f'(x) >0 and (equation )> (and equal to ) -1?
This question is an example thanks.
Uh, no. You just say f'(x) < 0 and nothing else. Or f'(x) > 0 and nothing else.

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