How do you answer this maths question?

I'm doing some work on direct and inverse proportion and I stumbled on this question which I don't understand. How do you answer it? many thanks

The variable P is inversely proportional to Q^2 i.e. P=k/Q^2

Q is increased by 40%.

What is the percentage change in P in percentage terms?

If Q increases by 40%, what does Q^2 increase by? And why am I asking you this?

I assume that you multiply Q by 1.4 so you'll end up with (1.4Q)^2, which is 1.96Q^2. That's as far as I got so far.