# Math Help - Integrals of Nonpositive functions

1. ## Integrals of Nonpositive functions

show that if "f" is integrable then f(x) is less then or equal to 0 on [a,b] is equal to the integral from a to b of f(x) dx is greater then or equal to 0

2. Originally Posted by 10roye
show that if "f" is integrable then f(x) is less then or equal to 0 on [a,b] is equal to the integral from a to b of f(x) dx is greater then or equal to 0
Please try to ask the question more clearly, that is incomprehensible.

CB

3. Originally Posted by 10roye
show that if "f" is integrable then f(x) is less then or equal to 0 on [a,b] is equal to the integral from a to b of f(x) dx is greater then or equal to 0
Since $f(x)=-1$ fits the conditions and assume $b>a$, then $\int_a^b (-1) dx=(a-b)<0$ this cannot be true in general.

CB