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Question
Expand (2p − 3q)2
Sum
Solution
It is known that, (a + b)2 = a2 + 2ab + b2 and (a − b)2 = a2 − 2ab + b2.
(2p − 3q)2
= (2p)2 − 2 × (2p) × (3q) + (3q)2
= 4p2 − 12pq + 9q2
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