Find the local linear approximation of the function f(x) = √15 + x at x = 10, and use it to approximate √24.9 and √25.1.

deleted. Sorry, i don't knunderstand what you are being asked to do.

I think the following is what is wanted:

Thanks Alan,

I still don't get it but that doesn't matter. (I have a calculator :/)

Hopefully the shadow will understand.