How do you simplify #(25-a^2) / (a^2 +a -30)#?
Given the following identities:
Note: for the second identity, it is rather more on factorization than a real identity. Hence, more practice could yield faster calculation speed and accuracy.
Using notable identityties. See below
First: we note that
Secondly we look for zeros on denominator in order to factorize it
Summarizing all results, we have