Right now were having a functions test soon, and i need quick help fast please
One Q is :
Explain, without graphing, why 2x^2 -1=y^2 is not a function, explain specifically what rule it breaks.
2Q:
Determine algebraically if the funciton is even,odd or neither. Justidy your answer.
f(x)=2x^2 +1
( i know we have to do the f(-x) and -f(-x) stuff, but i dont understand how to do it)
PLEASE HELP