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Question

Factorize the following
(p−q)2−7(p−q)−18

A
(pq+2)(pq9)
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B
(p+q+2)(pq9)
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C
(pq+2)(p+q9)
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D
None of these
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Solution

The correct option is D (pq+2)(pq9)
(pq)27(pq)18
Let pq=t
9+2=7
9×2=18
t27t18
t2+2t9t18
t(t+2)9(t+2)
(t+2)(t9)
=(pq+2)(pq9) Ans

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