how in detail you need your answer ? Because i don't know for which level do I approach because this is simple curve (parabola) and some curve's like this you get to know .... y = x^2 , -y=x^2 , x = y^2 , -x = y^2 ... and all can be done by 3 points or more if you like and connecting them... but if you need to do , region for which function is defined , add or even or neither, sing , asymptote's , first and second derivate... we will do it different
you should know also that y = x^2 and y = x^2 -1 or y= x^2 +1 are the same parabola just shifted up or down, left or right depending on which do you have ... y = x^2 have zero in point (x=0,y=0) , and y = x^2 +1 looks the same but have zero in (x=0, y = 1) so it's just shifted upwards by the y axis play little and you will have no problem with this type of curves