# Math Help - Calculus and proving inequalities

1. ## Calculus and proving inequalities

Hi guys,

I am a bit stuck on a certain part of a maths problem. I've done (a) and (b) already but I can't seem to get (c) which involves proving.

2. ## Re: Calculus and proving inequalities

And what did you get for a) and b) ?

3. ## Re: Calculus and proving inequalities

Basically I proved the equations shown in a) and b).

a) is easy, just use speed = distance/time and sub in the values.

for b) i differentiated T(x) and then subbed x into T(x) to get the equation shown in b).

If you want me to elaborate further, I guess I can take a picture of my working out to show you :/