(x^3 +13x^2 +39x-5)/(x+5)

(x^3 +13x^2 +39x-5)/(x+5)

=x^2(x+5)=x^3+5 x^2

x^3 +13x^2 +39x-5-x^3-5x^2=8x^2+39x

=8x(x+5)=8 x^2+40 x

8x^2+39x-8x^2-40x-5=-1x-5

=-1(x+5)=-x-5

-1x-5+x+5=0

answer: x^2+8x-1 r0