ANSWER :
4x
EXPLANATION :
From the problem, we have :
[tex]16x^2-12x[/tex]Let's factor each term :
[tex]\begin{gathered} 16x^2=2\times2\times2\times2\times x\times x \\ 12x=2\times2\times3\times x \end{gathered}[/tex]The Greatest common factor or GCF is the product of common factors between the two terms.
That will be :
[tex]2\times2\times x=4x[/tex]