Just a few questions I need help on so I can do the rest of my homework.

I have a question which I dont understand very well, the question is 'Solve the following inequalities by sketching by hand the curves of the functions involved' I dont understand exactly what to do with say an equation like p^2-5p+4<0 and 3x^2+5x-2<0

Square Form

How would I do:

2x^2+4x+6

-x^2-2x+5

-x^2+3x+10