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The easiest method to expand brackets would be to remember FOIL!
F - First
O - Outside
I - Inside
L - Last

Okay, so lets say you want to expand (3x+1)(2x+3), we'll...

This is a common question as we are often taught to differentiate by simply being told how to do the calculation, but not what it is we're really doing.
The concept
Diffe...

Convert 0.25 into a fraction where 20 is the denominator as there are 20 balls in total in the bag. 0.25 is the same as 1/4 and to convert this to 20 as the denominator multiply both the top and the bo...

This is a geometry question. 

We know that a square has 4 equal sides of x, and that it's area is given by A=x². 

So we can work out the length of the side of the...

First of all let's start with a lttle explanationn of waht a polynomial is.

A polynomial is a function of x denoted f(x) which is defined as

f(x)=a₀+a₁...