my question is why does the book say:

when u plugs in 1- in that.. u get 5(0)^4/5.. which is zero.. even though its 1- its still 0..

but here if u plug in o- to the e^x... u would get 1-1 = ln0 which does not exsist.. the book says the answer is infinite

i guess more speciafically my question is why does the first problem above come out to 1-1 = 0 even though its 1-... and on the 2nd equation u gotaa use the 0- as a actual 0- to get infinite..

any help.. sorry i know this question may not make sense.