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The easiest way to solve simultaneous equations is by elimination. This is the idea of cancelling out one of your variables, the X or Y so that you can solve the remaining variable and then substitute this a...

To answer this you multiply everything in the left bracket by everything in the right bracket, so rewrite the equation as x(x+3)+4(x+3). Then you can expand each more easily: x(x+3) = x 2 +3x 4(x+3) = 4x+4×3...

The Tsarist regime faced opposition more than once in history, the most prominent examples being the 1905 Revolution and the 1917 Revolution. The following essay examines the reasons which made the 1917 Revo...

You should always look at the number of marks offered for each question to help indicate to you how many points you should include in your answer. For example, for a 3 / 4 mark source question it would be go...

I often find it difficult to remember all the different identities, so what is useful is instead to just remember the familiar identity sin^2(x) + cos^2(x) = 1 that we have come across many times, and divide...