ISI ME1 2012

[kratika]

what is the integration of 1/x over values -4 and -1?

a. ln4
b.undefined
c.ln(-4)- ln(-1)
d.none of the above

shouldn't the answer be option b bcz log is not defined over negative values?? also since d differentiation of log x gives 1/x which cannot be negative, how can we take negative values when we integrate it?? plz help!!!

[anon_econ]

integral of 1/x is |ln x|

[neha.]

I think integration of 1/x is log lxl so answer shud be -log4 which is none of the options

[deepak]

http://www.wolframalpha.com/input/?i=integral+%281%2Fx%29+between+%28-4%2C-1%29