Question

CALCULA (2x+2)/(x3-2x2-9x+18)-(x-3)/(x3-x2-14x+24)

Answer 1

(2x+2)/(x3-2x2-9x+18)-(x-3)/(x3-x2-14x+24)=0
 
(2x+2)(x3-x2-14x+24) = (x-3)(x3-2x2-9x+18)

2x4-2x3-28x2+48x+2x3-2x2-28x+48 = x4-2x3-9x2+18x-3x3+6x2+27x-54

2x4-30x2+20x+48  =  x4-5x3-3x2+45x+54

2x4-30x2+20x+48-x4+5x3+3x2-45x-54=0

x4+5x3-28x2-25x-6=0