Question

is the function y+2x^2=-2

Answer 1

Are you asking if it is a function?

Answer 2

yes sorry

Answer 3

Yes. For a brief explanation. A function maps one value of an independent variable (in this case x) and maps it or plots it to a single value of y. In other words, for ANY value of x that you plug in to that equation, you get DIFFERENT y values.
For example: x=0-> y=-2 but x=1->y=-4 I hope this helps!