Evaluate:78 X 82 – InterviewSolution

1.

Evaluate:78 X 82

Answer»

Given 78 X 82

We can write 78 as 80-2 and also 82 as 80+2

We know that (a + b) X (a – b) = a²– b²

Here a= 80 and b = 2

Applying the above formula we get

(80 + 2) X (80 – 2)

= (80)²– (2)²

= 6400 – 4

= 6396

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