Question

factorise the following r2-9s2​

Answer 1

Answer:

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

Step-by-step explanation:

r² - 9s²  = (r)² - (3s)²  = (r+3s)(r-3s)

Answer 2

Answer:

r² - 9s² = (r)² - (9s)²

{(a)² - (b)² = (a+b)(a-b)}

Now, (r)² - (9s)² = (r+9s)(r-9s)