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Question
Factorise the following expression.
63p2q2r2s – 9pq2r2s2 + 15p2qr2s2 – 60p2q2rs2
Solution
We have,
63p2q2r2s – 9pq2r2s2 + 15p2qr2s2 – 60p2q2rs2
= 3 × 21p2q2r2s – 3 × 3pq2r2s2 + 3 × 5p2qr2s2 – 3 × 20p2q2rs2
= 3pqrs(21pqr – 3qrs + 5prs – 20pqs)
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