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First, note that we have x² in the denominator. This tells us that x² cannot equal to 0. So we have the boundary condition that x is not equal to 0. Now, to get rid of the denominato...

History GCSE and A Level qualifications all require you to look at and evaluate sources. When you are looking at a source, your main goal is to consider its NOP (Nature, Origin, and Purpose). Whether a so...

Analysis: First define tax and explain that this could be ad valorem (percentage of price) or per unit (set tax per unit). Explain why the government would want to do this - overconsumption can cause obes...

=((143x)-(147y))+((-2x21)-(-2xy))=42x-98y-42x+2xy=2xy-98y

So what does it mean when we factorise? Well, we want to take the highest common factor (HCF) of both of these algebraic terms and we want to take that outside the back to simplify the expression. First, ...