The roots of a quadratic equation are 6 and 3/4. If one of the two factors of the&nbs

If  b/a   is a root...then   ( ax  - b )  is a factor.....

To see this...set   

ax  - b  = 0   add b to both sides

ax  = b     ...divide both sides by a

x   = b / a

So...this means that  3/4 is a root   and  ( 4x - 3)  is a factor  ⇒  C