Determine (a) how many x-intercepts the parabola has and (b)whether its vertex lies above or below or on the x-axis.

1. y = x^2 - 5x + 6

2. y = x^2 + 2x - 1

If you can please explain to me how to work this problem I'd be very grateful for I am greatly confused with these problems.

PS: I'n the book it says to do it without drawing a graph of the equation so how do I find it without graphing it?