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When thinking about stationary points, it is important to remember that these points happen when the gradient of the curve is 0 (-> dy/dx = 0), or if you prefer, when the rate of change of a graph is 0...

Remember, the mark scheme is looking for ‘sophisticated expression’, but what does that actually mean? Put simply, ‘sophisticated expression’ is actually just when a student has enough confidence in th...

To factorise z³+1 into a linear and quadratic factor, it is best to try the factor theorem first. We set the equation to zero: z³+1=0.We need to find a value of z such that the above...

Transmitting Along Neurones

When a nerve cell is not stimulated, it is in a resting state. During this state, the inside of the axon is relatively more negative th...

We want to make y the subject of the equation and so we need to write it in the form y=f(x) where f(x) is a function in terms of x.When rearranging equations with fractions for a certain subject, factoris...