Graph the parabola y=2x^2

This is the 'regular' parabola y=x^2, but it has been STRETCHED vertically by a factor of 2.
The following point from the 'regular' parabola map to these NEW points on the stretched parabola.
(-2,4) = (-2,8)
(-1,1) = (-1,2)
(0,0) = (0,0)
(1,1) = (1,2)
(2,4) = (2,8)
See how the y-coordinate has been multiplied by 2 in each case? That's the vertical stretch.