Question

use the formal limit def of the derivative to fond the derivative of f(x)=(sqrt 2x)-5 at x=2

Answer 1

\[f(x)=\sqrt{2x}-5\]\[f'(x) =\lim_{\Delta x\to 0}\frac{f(x+\Delta x)-f(x)}{\Delta x}\]

Answer 2

actually there is a better way to write this. but I am busy ATM. someone will show you.