Evaluate (4x-5y)² using appropriate identities
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a²+b²-2ab
16x²-40xy+25y² ans....
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Answer:
(4x-5y)²
=(4x)²+(5y)²-2×4x ×5y...........[ •.• (a-b)² =(a²+b²-2ab) ]
= 16x²+25y²-40xy
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