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प्रश्न
Expand the following, using suitable identities.
(0.9p – 0.5q)2
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उत्तर
We have,
(0.9p – 0.5q)2 = (0.9p)2 + (0.5q)2 – 2 × 0.9p × 0.5q ...[Using the identity, (a – b)2 = a2 + b2 – 2ab]
= 0.81p2 + 0.25q2 – 0.9pq
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