Answer:
4x^2
Explanation:
The greatest common factor of 12, 8, and 16 can be no larger than the smallest difference between these numbers, which is 4. 4 is a factor of each number, so is the GCF of them.
The exponent of the greatest common factor of x^4, x^3, and x^2 can be no larger than the smallest of these exponents, which is 2. So, the GCF of the variable portion of the terms is x^2.
The product of the coefficient GCF and the variable GCF is ...
... 4x^2