Question

using identities , evaluate 78multiple 82

Answer 1

Hey mate!

Here is your answer > >

78×82 can be written as (80-2)*(80+2)

We know that

(a-b)(a+b)=a^2-b^2

In this question, a is 80 and b is 2

So, 80^2-2^2=6400-4=6396

Hope it helps!

Thankyou ☆ ☆

Bebrainly

Answer 2

78 × 82

=> (80-2)(80+2)

using identity

(a-b)(a+b) = a² - b²

=> (80)² - (2)²

=> 6400 - 4

=> 6396 .... answer

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Hope it may help you.