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प्रश्न
Use the direct method to evaluate :
(4+5x) (4−5x)
बेरीज
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उत्तर
Note: (a+b) (a−b) = a2 − b2
(4+5x) (4−5x)
= (4)2 − (5x)2
= 16 − 25x2
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