Register to reply 
Secant line in Fermat's Theorem 
Share this thread: 
#1
Mar812, 12:07 PM

P: 783

I'm trying to understand something in Fermat's Theorem. I can't really phrase it in words, but I will write what my textbook says.
Apparently if [tex] \lim_{x→c}\frac{f(x)f(c)}{xc} > 0 [/tex] then there exists an open interval (a,b) containing c such that [tex] \frac{f(x)f(c)}{xc} > 0 [/tex] for all c in that interval. How does this follow from the definition of the derivative? I appreciate all help. Thanks! 


Register to reply 
Related Discussions  
Fermat's last theorem  General Math  5  
Fermat's little theorem  Calculus & Beyond Homework  6  
Fermat's theorem  Linear & Abstract Algebra  0  
Equation of secant line  Precalculus Mathematics Homework  6  
Fermat's Last Theorem (FLT)  Linear & Abstract Algebra  10 