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Look for the corresponding letters to each number. So, as an example those with a. remember that the + or - before it tells us whether it is to be added or subtracted

There are 2a-a+3a so that = 4a...

At first this equation seems tricky, but we can perform a clever substitution to simplify it. We notice that if let y = 2^x, then we can rewrite this as:

8(y^2) - 9y + 1 = 0

This now becomes...

This question relies on knowledge of algebraic expressions and highest common factors.

What is the highest common factor which goes into the expressions 8y and 4y^2.

The answer is 4y. This i...

Complex numbers have three primary forms: the general form, z=a+ib; the polar form, z=r(cosθ+isinθ); and the exponential form, z=rexp(iθ). To convert from the general form to either form you need to find ...

A stationary point is where the gradient is exactly zero - the curve is neither increasing or decreasing. This means that we need to differentiate y to find dy/dx and then set this equal to 0. Doing this,...