Question 26358
It seems that you had a bit of trouble distributing the 2 in the second part of the expression. Here's what you do:

x(4x^2+3x-5)-2(4-x^2)
distribute both the x and the -2 throughout the expressions they're outside of
4x^3+3x^2-5x-8+2x^2
Now you can simplify it into:
4x^3+5x^2-5x-8

Enjoy!