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Composite functions can be thought of as 'functions within functions'. For example, let's suppose that 

f(x) = x³

g(x) = x + 5

defined for all real numbers.

...

A complex number has the form a+bi. We call a the 'real' bit (ie. the bit on a regular number line) and b is the 'imaginary bit. 
Multiplying complex numbers is done in a very similar way to multiply...

First, we need to rearrange the equation into a quadratic. A quadratic equation will always have a squared element. 

To this, we move everything over to the left hand side of the equation and ...

A complex number is a number made up of a real and imaginary part.