Is this a mistake? I don't see it.

[hopelynnwelch]

I don't see how -3h changes to +3h here. This is my teachers solution. This time I really think this is wrong. Can someone confirm?

 

[Ishuda]

I don't see how -3h changes to +3h here. This is my teachers solution. This time I really think this is wrong. Can someone confirm?




View attachment 4945

It looks like the function is maybe\(\displaystyle \frac{\sqrt{1-x} + 2}{3x}\) in which case the top lline is correct and, as you pointed out, the sign of the 3h got swapped "for no reason".

 

[hopelynnwelch]

It was! I thought so. Thanks Ishuda.