book Maths Puzzle Numerical Ability

One more.
I am supposed to multiply and write as a polynomial in standard form: (2x+1)(x^3-x+2). I came up with 2x^4+1x^3-2x^2+3x+2. My question is how to put it into standard form?

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book Other Question

The winner of a recent election had 220 more votes than the loser. There werea total of 810 votes for the two canidates. How many votes did each candidate have? The demand and supply equations for a certain item are given by
D=-5p+40
S=-p^2+30p-8
Find the equilibrium price.

Please help. Thank you.