This is an example of a STEP question which is an exam you have to sit if you want to study maths at Cambridge uni.
If you've done maths and further maths at A level then you know everything you need to be able to answer the questions but the style of the questions is quite different.
The first photo is what you're given in the exam and then I've given my solution on the next (5!!) pages. I'm sorry I couldn't make it shorter but I wanted to explain everything so people can (hopefully) follow along.
Message me if something doesn't make sense or if you want to talk about maths/physics(or anything tbh)
I'm currently working on a blog so I can post bigger photos and explain a bit more about what's going on.
Hope you're all having a great day!!!