Answer
$4x^5+x^4+5x^3-8x^2+2x-7$
Work Step by Step
Removing the grouping symbols and then combining like terms, the given expression, $
(3x^5+5x^3-5x^2-3)+(x^5+x^4-3x^2+2x-4)
,$ simplifies to
\begin{array}{l}
3x^5+5x^3-5x^2-3+x^5+x^4-3x^2+2x-4
\\\\=
(3x^5+x^5)+x^4+5x^3+(-5x^2-3x^2)+2x+(-3-4)
\\\\=
4x^5+x^4+5x^3-8x^2+2x-7
.\end{array}
