## anonymous 4 years ago Let f(x) = 10x2 f(3 + h) = 10h^2 + 60h + 90 f(3+h) - f(3) / h = 10h + 60 what is f ' (3)?

1. anonymous

as h --> 0

2. campbell_st

well use $\lim_{h \rightarrow 0} (10h^2 + 60h + 90 - 90)/h = \lim_{h \rightarrow 0} h(10h + 60)/h$ $\lim_{h \rightarrow 0} 10h + 60 = 60$

3. anonymous

oh so basically youre using the power rule?