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प्रश्न
Evaluate: `(2"x"-3/5)(2"x"+3/5)`
बेरीज
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उत्तर
`(2"x"-3/5)(2"x"+3/5)`
`=(2"x")^2-(3/5)^2` .......[ ∵ (a − b) (a + b) = a2b2]
`=4"x"^2-9/25`
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