Question

. Factorise using appropriate identity: 81x^2
– 121y^2​

Answer 1

Answer:

The answer will be (9x + 11y)(9x - 11y).

Step-by-step explanation:

81x^2 – 121y^2

Using identity (a+b)(a-b) = a^2 - b^2;

(9x)^2 – (11y)^2

(9x + 11y)(9x - 11y);

That's all.