Let f and g be functions of x, where a is an unknown constant. What is a valid expression for quantity f over g end quantity prime if f = ax and g equals quantity 4 times x cubed plus 1 close quantity over x question mark (10 points)

quantity 12 times x squared minus 2 times a times x close quantity over the quantity 4 times x cubed plus 1 close quantity squared

quantity 6 times a times x to the fourth minus 1 close quantity over x squared

a over the quantity 6 times x

quantity negative 4 times a times x to the fourth plus 2 times a times x close quantity over the quantity 4 times x cubed plus 1 close quantity squared