Anyone who is good at math
find the values of a and b that make the second expression equivalent to the first expression. assume that x > 0 and y ≥ 0.
a = and b=

What was done from the first to the second equation was that the fraction was simplified. 126 and 32 have a common factors of 2. 
126/32=(63*2)/(16*2)
The 2s in the top and bottom can cancel out, leaving the fraction 63/16. 
In addition, since there are x terms on the top and bottom, they cancelled out as well. 
x/x^3=1/x^2
This leaves an x^2 term on the bottom. 
Thus, if a is 16, and b is 2, you will have an equivalent form of the fraction.