i have the equation:
so i get this
when i check the answer i have this :
i do not know how to go from what i have to the answer.
for some reason √ doesnt like it in math wrap.
(Eventually you'll take the limit of your answer as h goes to 0. Then you'll see why this simplifies the problem rather than make it more difficult.)
"FOIL" out the top. You will have "h" remaining. Just h. This cancels with the h factor on bottom.
Then directly substituting h = 0 will give something meaningful, and the answer.