Question

factorise 27m cube - 343n cube​

Answer 1

Answer:

(3m-7n)(9m^2+49n^2+21mn)

Step-by-step explanation:

27m^3-343n^3

(3m)^3-(7n)^3

Using identity, a^3-b^3=(a-b)(a^2+b^2+ab)

=(3m-7n)(9m^2+49n^2+21mn)