Plz help me its science i suck at math

The parabola y = x² - 4 opens: a.) up b.) down c.) right d.) left

Is a positive integer raised to a negative power always positive

Which function in vertex form is equivalent to f(x) = x2 + 6x + 3? f(x) = (x + 3)2 + 3 f(x) = (x + 3)2 − 6 f(x) = (x + 6)2 + 3 f(x) = (x + 6)2 − 6