Question 855240
x^4-4x^2-32/2x^4+11x^2+12 
factor the numerator and denominator
(x^2-8)(x^2+4) / (2x^2+3)(x^2+4)
you can cancel (x^2+4) term from numerator and denominator
(x^2-8) / (2x^2+3)