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Question

Question 85 (xv)

Expand the following, using suitable identities.

(0.9p0.5q)2


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Solution

We have,
(0.9p0.5q)2=(0.9p)2+(0.5q)22×0.9p×0.5q
[using the identity, (ab)2=a2+b22ab]
=0.81p2+0.25q20.9pq


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