Question

Based off of the standard form of a parabola how do you know if it opens down or uo

Answer 1

If the coefficient of x^2 is positive it opens upwards. Negative coefficient of x^2  downwards

Answer 2

The standard form of a parabola is y=ax²+bx+c, 
If the coefficient "a" is positive (a>0) the parabola is open up
and if a<0 (negative) it opens down