Question

( x4 - 13x3 + 30x2 + 4x - 40 ) : ( x2 - 9x - 10 )

Answer 1

$\frac{x^{4} - 13x^{3} + 30x^{2} + 4x - 40}{x^{2} - 9x - 10} = x^{2} - 4x + 4$

Sendo:
$(x^{2} - 9x -10)*(x^{2}-4x+4) = x^{4}-13x^{3}+30{^2} +4x-40$