Calculus Finals Review: Seeking Tutoring/Help

[himanshu121]

$$f'(4)=\lim_{h\rightarrow 0}\frac{f(4+h)-f(4)}{h}$$

$$f'(4)=\lim_{h\rightarrow 0}\frac{\frac{9}{4+h}-\frac{9}{4}}{h}$$
$$f'(4)=\lim_{h\rightarrow 0}-\frac{9h}{4h(4+h)}$$

so f'(4)=-9/16

 

[hodeez]

thanks himanshu, but i seem to have got it in school, before i got a chance to see your answer. Even so, the problem was logically incorrect ( f'(4) was suppose to be f'(3)). I should be 85+ for my finals. thanks.