What are these in function form

QUESTION 4.
The given function is [tex]f(x)=48x^2-32x[/tex].
The highest common factor is [tex]16x[/tex].
We factor to obtain;
[tex]f(x)=16x(3x-2)[/tex]
QUESTION 5
The given function is
[tex]g(x)=20x^2-8x[/tex]
The highest common factor is 4x.
We factor to obtain;
[tex]g(x)=4x(5x-2)[/tex]
QUESTION 6.
The given function is [tex]h(x)=42x^3-35x^2[/tex].
The highest common factor is 7x.
We factor to obtain;
[tex]h(x)=7x^2(6x-5)[/tex]