Question

factorise the expression r² - 9s²​

Answer 1

factorise the expression r² - 9s²

Answer:

r² - 9s² = (r)² - (9s)²

{(a)² - (b)² = (a+b)(a-b)}

Now, (r)² - (9s)² = (r+9s)(r-9s)

Answer 2

Answer: (r - 3s) (r +3s)

Step-by-step explanation:

Explanation:

(r)² - (3s)² = (r - 3s) (r +3s)