using identities (formulae),evaluate:78×82
Asked by sahibsinghsekhon000
| 6th Jan, 2021,
08:33: AM
Expert Answer:
Using the identity (a - b)(a + b) =a2 - b2
78 x 82 = (80 - 2) x (80 + 2) = 802 - 22 = 6400 - 4 = 6396
Answered by Renu Varma
| 7th Jan, 2021,
10:48: AM
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