Question

using identity factorise x square minus y square by 81​

Answer 1

Step-by-step explanation:

x^2-(y^2)/81

=x^2-(y^2)/(9^2)

=x^2-(y/9)^2

=[x-(y/9)][x+(y/9)].

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