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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...

Set f(x) = y. Then rearrange your equation to find x on it's own as some function of y. If you have a x term on both the top and bottom of a fraction then you will have to multiply the whole equation ...

The chain rule, product rule and quotient rule are all 3 methods of differentiating complex functions.

Chain rule

The chain rule...