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