Posted by sara on .
If f(1) > 0 and f(3) < 0, then there exists a number c between 1 and 3 such that f(c) = 0. Is this true or false?
Please and thank you

calculus 
bobpursley,
Absolutely true, uuuuhhh, if f(x) is continuous.

calculus 
sara,
Can you please explain why it is true
Please and Thank you 
calculus 
bobpursley,
If the curve is continuous, and at x=1 f(x) is positive, and at x=3, f(x) is negative, somewhere it crossed the axis.