Factorise 14 pq - 35 pqr
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We have 14pq = 2 × 7 × p × q = 2 × (7 × p × q)
35pqr = 5 × 7 × p × q × r = 5 × (7 × p × q) × r
∴ 14pq + 35 pqr = 2 × (7 × p × q) + 5 × (7 × p × q) × r
= (7 × p × q)[2 + 5 × r]
= 7pq(2+5r)
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