Expand the expression $(x^{4}+2x^{3})(4x+9)$.
$4x^{5}+17x^{4}+18x^{3}$
$5x^{4}+13x^{3}+8x^{2}$
$4x^{3}+11x^{2}+13x$
$6x^{4}+5x^{3}+11x$
$9x^{4}+8x^{3}+11x^{2}$
Find the roots of $f(x)=x^2+2x-3$
x=1,-3
x=2,1
x=1,3
x=-1,3
x=0,3
