For each quadratic, state the direction of opening and the y-intercept.
a.y= 3x^2+2x-5
b.y=x^2-7x
c.y=-x^2+12
look at the 2nd order (squared) term coefficient
... positive opens up , negative opens down
x equals zero at the y-intercept ... (0,?)
... plug the zero into the equation to find y