Any others, I tryed it but didn't seem to output an answer.

how about you include what equation you used? either you didn't input it correctly, you dont understand how to use it, or it doesn't support what you're trying to do. i just inputed a simple "x+3=1" and it told me "x = -2"

replace x with -2

2x²-3x+3
2(-2)²-3(-2)+3

was this really difficult for people? dropped out of high school and I got the answer in my head.
p(-2) = 2(-2)^2-3(-2)+3
2(4)-3(-2)+3
P(-2) = 8 - - 6 + 3
P(-2) = 8 + 6 + 3
P(-2) = 17 should be the answer to the question
P(-2)/-2 = 17/-2
P = -8.5

I'm guessing he wants to solve MANY of these without thinking about it lol

I would just make a program on my ti calc to do this...

really lazy. What's the point of being in school if you're just going to get something to do the thinking for you.