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प्रश्न
Simplify : (4x – 5y) (5x – 4y)
योग
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उत्तर
(4x – 5y) (5x – 4y)
= 4x(5x – 4y) – 5y(5x – 4y)
= 20x2 – 16xy – 25xy + 20y2
= 20x2 – 41xy + 20y2
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Multiplying a Polynomial by a Polynomial
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