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Grade 128 grade maths

Using identities, evaluate.
78 x 82 ??????????????????????

Profile image of Pawan Prajapati
5 Years agoGrade 12
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1 Answer

Profile image of Harshit Singh
5 Years ago
Dear Student

78 x 82
= (80 - 2)(80 + 2)
= 80^2- 2^2
= 6400 - 4
= 6396

Thanks