GCSE revision notes

Identities and the sign at GCSE

To understand the idea of an identity, consider the following question:

Question: Show that

Solution: What this question wants is for you to expand and simplify the LEFT HAND SIDE and show that it equals the RIGHT HAND SIDE.

Well, here goes:

Perfect, we have got exactly what the question wanted

We will now consider a range of other examples up to A*. I have highlighted any important negative signs in red

Example 1:

Show that

Example 2:

Show that

Algebraic Fractions potentially A*