Answer:
The correct option is C
Step-by-step explanation:
81x²+72x+16
We have to break the middle term:
If we multiply 81 by 16 we get 1296:
The same answer we get when we multiply 36 by 36:
36*36=1296
And if we add 36+36 then we get the middle term which is 72.
So,
=81x²+72x+16
=81x²+36x+36x+16
=9x(9x+4)+4(9x+4)
=(9x+4)(9x+4)
Thus the correct option is C ....
