Question

evaluate the following by using identity 3
(81)^2 -(19)^2
I will mark the brainliest ..

Answer 1

hey your ans is here

_____

given

(81)2-(19)2

this is forming identity

a2-b2=(a+b)(a-b)
so

(81)2-(19)2=(81+19)(81-19)=(100)(62)

so

answer is 6200

_____

Answer 2

Hyy...
Here's ur answer.....

The 3rd identity is
x2 - y2 = (x+y)(x-y)
So, (81)^2-(19)^2=(81+19)(81-19)
= 100*62
=6200.

Hope its correct..^_^
and plz mark as brainliest as u have said along with the question.:-) :-)