Hey, I've gotta brush up on my integration / differentiation before the september term and have come across a question that's giving me trouble (well.. a few tbh but I might go back to them later..)

Quote:

solve, given x=10, t=0

Cut-down workings:

rearrange and differentiate with respect to x

And this simplifies /rearranges to:

Problem

According to the textbook, the answer should be:

The closest I've gotten so far is as follows:

t is given in the question as 0, therefore:

if , then

x is given as 10, therefore:

However, I'm probably going at it slightly wrong since I can't get A=10 to become c=10 ...

Any help?

Thanks,

kwah