(x^2-2)^4(3y+5)-(x^2-2)(y+12) = ((x^2-2)(x^2-2)(x^2-2)(x^2-2))(3y+5) - (x^2-2)(y+12)= (x^2-2)^4 * (3y+5) - (x^2-2)(y+12)
(x^2-2)^4(3y+5)-(x^2-2)(y+12) = ((x^2-2)(x^2-2)(x^2-2)(x^2-2))(3y+5) - (x^2-2)(y+12)
= (x^2-2)^4 * (3y+5) - (x^2-2)(y+12)