C-03-Q214: What must be added to $9x^2 + 16y^2$ to make a perfect square?

C-03-Q214: What must be added to $9x^2 + 16y^2$ to make a perfect square? | প্রশ্ন করি

What must be added to 9x2+16y29x^2 + 16y^29x2+16y2 to make a perfect square?