Math graph extremely confused

Question

f(x) = $x^2-4,x\ge 0$

graph this function

Answer 1

This is a parabola and you can graph it on a graphing calculator, but if you need to do it by hand,

just calculate a few points, say for x = 0, 1/2, -1/2, 1,-1 , 2 and -2 and connect them with a sketched smooth curve.