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ShotGunGirl
Factor the four-term polynomial. pq - 3r +pr - 3q
Hint: Rearrange the terms. \(\Large \color{MidnightBlue}{\Rightarrow -3q - 3r + pr + pq }\)
q(p-3)+r(p-3) (q+r)(p-3)
\(\Large \color{MidnightBlue}{\Rightarrow -3(q + r) + p(q + r) }\) \(\Large \color{MidnightBlue}{\Rightarrow (p - 3)(q + r) }\) Got it?