Question

3. Factorise the following expressions:
(i) r^2-9s^2​

Answer 1

(r + 3s) (r - 3s)

Step-by-step explanation:

r^2 - 9s^2 = r^2 - (3s)^2

now, using identity : a ^2 - b^2 = (a + b) (a - b)

(r + 3s) (r - 3s)

hope u understand it........

Answer 2

Answer:

Please follow me

Step-by-step explanation:

This is your answer