Question

Factorise 49p2 + 81q2 +144r2 – 126pq - 216qr + 168pr      





please answer with steps ​

Answer 1

Step-by-step explanation:

(7p)²+(-9q)²+(12r)²+2.7p.(-9q)+2.(-9q).(12r)+2(7p)(12r)

=(7p-9q+12r)²