We have the next expression:
[tex]pq\text{ - pr + 6q-6r}[/tex]
Factorize using factor by grouping.
First, let's find the common terms. The one who is in all terms or majority terms.
In this case, let's use p:
[tex]p(q-r)+6q-6r[/tex]
Factorize the common term 6.
[tex]p(q-r)+6(q-r)[/tex]
Look at the expressions, both are multiply by (q-r), so we can rewrite the expression like this:
Factorize the common term (q-r)
[tex](q-r)(p+6)[/tex]
