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While this question may appear unfamiliar at first, it is just a quadratic equation in disguise. Rearranging such that it equals 0:

x^2 + 5x - 36 = 0

Now this equation is re...

In A-level books, each is separated into several topics with short lists of vocabulary. By talking about these topics, I will ask you to write any important new wword down and ask you to learn them at ...

Nouns and pronouns are very similar, so be careful not to get them confused!

A noun is an object or a thing, for example:
'The cat is sleeping.'
Here the noun...

At first this looks quite daunting as it combines a number of different indices (powers) and a fraction. 

The rules for indices are just something that you have to learn - so don't worry ...

It's experimentally observed that ionisation energies have a general increase as one moves across the period: the first ionisation energy of lithium is ~500 kJ mol‑1, whereas that of n...