Question

el resultado de (x^2-4/x^2+7x+12) ( x^2-9/x^2-5x+6) es :

Answer 1

$(x^{2} - 4 x^{2} + 7x +12) . ( x^{2} -9 x^{2} -5x + 6) =$
$(-3 x^{2} + 7x + 12) . (-8 x^{2} -5x + 6) =$
$24 x^{4} + 15 x^{3} - 18 x^{2} - 56 x^{3} - 35 x^{2} + 42x -96 x^{2} - 60x + 72 =$
$24 x^{4} - 41 x^{3} - 149 x^{2} - 18x + 72$