Question 9605
 x^4 - 4x^2 - 7x - 28
 = x^2(x^2-4) - 7(x+4)
 = x^2(x-2)(x+2) - 7(x+4) =????

 Also try synthnic division, there is no factor of deg 1
 and clearly it is not a product of two 2nd degree rational polynomials.

 Plz check your left hand side.

 Kenny