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Whilst it is very easy to just plug the numbers into the formula you are given on your formula sheet there is a much faster and more intuitive method of doing this. If we have n numbers beginning at a wit...

I'm going to show the answer to this question in two different ways. - The first is perhaps more obvious but the second is much more elegant.Taylor series expansion: Using Taylor expansion (or your trusty...

A question from 13 + specimen paper.

After the price of TV is reduced 30 % the price is £280. This means that £280 is 70% of the original price.

Therefore if you make an equation 280 x...

Question: 

Expand (2x-3)(4x+4) 

We will be using the FOIL method. FOIL is an ancronym: 

F=first

O=outside

I=inside

L=last

So, to begin, we start...

First rule of sources: don't simply claim bias. Bias means nothing without explanation and shouldn't be assumed, if you're going to dismiss a source because of this, you need an explanation such as 't...