Question

factorise the following expression r²-9a²​

Answer 1

Step-by-step explanation:

To factorize an algebraic expression, the highest common factors of the terms of the given algebraic expression are determined and then we group the terms accordingly. In simple terms, the reverse process of expansion of an algebraic expression is its factorization.

Answer 2

Answer:

r^2 - 9a^2

r^2 - 3^2 a^2

r^2 - (3a)^2

using identity

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

answer :. (r+3a) (r-3a)