Step 1: To make this expression easier to work with, use the variable in place of and use the variable in place of . We will replace the original values in a later step.
Step 2: Factorise .
can be factorised as .
For the factorisation of any trinomial, we know that the product of the extremes + the product of the means = the middle term in the trinomial.
Now, we can factorise .
Step 3: Substitute for and for .