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प्रश्न
Evaluate: (m + 3) (m − 3) (m2 + 9)
बेरीज
उत्तर
(m + 3) (m − 3) (m2 + 9)
= (m)2 − (3)2 (m2 + 9) ......[ ∵ (a − b) (a + b) = a2 − b2]
= (m2 − 9) (m2 + 9)
= (m2)2 − 92
= m4 − 81
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Product of Sum and Difference of Two Terms
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