can i get an explanation?

Suppose that f is a function given as at) 2 V 4:1: -+ 75. Simplify the expression f (a: 1171%): 7 _, n: + h) =' Simplify the difference quotient, \"MM \"3) C::::] Rationalize the numerator in the difference quotient (if applies, simplify again ) fiw + h)- f($)_ h The derivative of the function at a: is the limit of the difference quotient as h approaches zero f,(m)_l ex-+11; flas')_