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just get a grid.
make a x,y T table
And start plotting. THe more points the better and just draw a smooth fitting curve. And there is always google. Just paste an expression without the y=
Well first, you got to move everything to one side so that it equals zero or you have to make y equal to zero. After that, you have to factorise and find the x-intercepts. If you can't factorise it, then you have to use the quadratic formula to find the x-intercepts. Then once you've done that, you have to find the y-intercept. That would mean you have to make x equal to zero.
Afterwards, you can determine whether it is concave up or concave down. If it's concave up the coefficient of x^2 is positive. If the coefficient of x^2 is negative, then you know the curve is concave down. Then once you've done that, just run down a parabolic curve shape making sure you pass through those critical points.