83 using identities find the value of @ 72²
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Answer:
117 = 100+17
83 = 100-17
NOW,
117 × 83
(100+17) (100-17)
USING IDENTITY (A+B)(A-B) = A²-B²
NOW,
(100+17) (100-17)
100²-17²
10000-289
9711
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