Question 603731
[x-4/x^2][x^4/x^2-3x-4]= 
a.x^6/x+1
b.x^6/x-4
c.x^2/x+1
d.x^2/x-4
**
[x-4/x^2][x^4/x^2-3x-4]
=[x-4/x^2][x^4/(x-4)(x+1)]
x^2 and (x-4) cancel out
=x^2/(x+1) (ans c.)