Homework Help: Analysis: Limits, strictly increasing, differentiability

Shackleford · Nov 16, 2011

I've worked all of these out. I'm mostly confident I did them correctly, but I'm prone to overlook subtleties or counterexamples sometimes.

http://i111.photobucket.com/albums/n149/camarolt4z28/1ab-1.png [Broken]

http://i111.photobucket.com/albums/n149/camarolt4z28/1gf2-1.png [Broken]

SammyS · Nov 16, 2011

1. b is false.

Is f(x) positive ?

I'll look at the other problem soon.

Shackleford · Nov 16, 2011

SammyS said: ↑

1. b is false.

Is f(x) positive ?

I'll look at the other problem soon.

Oh. You're saying the limit could be negative infinity, too, not just positive infinity. That's true.

SammyS · Nov 16, 2011

Or, f(x) could alternate from large positive to large negative values as x → ∞.

SammyS · Nov 16, 2011

The second link looked OK to me.

Shackleford · Nov 16, 2011

SammyS said: ↑

The second link looked OK to me.

Good catch on (b). Thanks for the review!

deluks917 · Nov 16, 2011

Its possible your professor wants you to write out your steps a bit more.

Shackleford · Nov 16, 2011

deluks917 said: ↑

Its possible your professor wants you to write out your steps a bit more.

For which ones?