what is (-2x^4-3x+5x^2-x)*(x-3)

$$\\(-2x^4-3x+5x^2-x)*(x-3)\\\\
=(x-3)(-2x^4-3x+5x^2-x)\\\\
$First simplify inside the brackets if you can$\\\\
=(x-3)(-2x^4+5x^2-x-3x)\\\\
=(x-3)(-2x^4+5x^2-4x)\\\\
=x(-2x^4+5x^2-4x)-3(-2x^4+5x^2-4x)\\\\
$now expand the brackets but be careful with the -3$\\\\
=x(-2x^4+5x^2-4x)+(-3)(-2x^4+5x^2-4x)\\\\$$

That is a good start - you see if you can finish it