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sketching graphs Watch

1. So i did a test recently and my weakest area is sketching graphs, i just get consued what teh shape is going to be if its a cubic generally.

Example: I know the basic shape as its a cubic and know it will intercept the y axis at 4 but the 3x^2 term is confusing me when drawing it
2. Think about the x axis intercepts as well, i.e. solve y=0. E.g. x=2 works, and then factorise it to:

(x-2)(x^2 -x -2)

x=2 was a guess, and then solve the quadratic to get the other two.
3. You always have to put x and y equal to zero to find the points where a graph crosses the x axis and the y axis.

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Updated: December 12, 2010
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