Question

36c^2-84cd+49d^2 factorise completely​

Answer 1

Step-by-step explanation:

36c^2 - 84cd + 49d^2

=(6c)^2 - 6c*7d +(7d)^2

IDENTITY: a2 - 2ab + b2 = (a-b)^2

=(6c-7d)^2

=(6c-7d)(6c-7d)