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So, if we have this:

y = 2x^2
This just means that he's twice as tall as normal.
( All the outputs are twice as big! )

When you draw him, just go up twice as far!

graphing y = 2x^2 ... go over 1 and up 2 instead of 1, giving points ( -1 , 2 ) and ( 1 , 2 )

graphing y = 2x^2 ... go over 2 and up 8 instead of 4, giving points ( -2 , 8 ) and ( 2 , 8 )

That wasn't that bad.  The tricky part is drawing them so you don't get a "V" point down by the vertex.  There's another graph that's a "V" shape, so be careful about this.