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प्रश्न
Simplify by using formula :
(5x - 9) (5x + 9)
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उत्तर
(5x - 9) (5x + 9)
= (5x)2 - (9)2
= 25x2 - 81
(Using identity : (a + b) (a - b) = a2 - b2).
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