Quadratics

start with the fact that x = 1 is a zero ... then try synthetic division to determine the other two zeros?

btw, this is a cubic function, not a quadratic
 
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If you didn't see immediately that x = 1 is a zero, you could use the rational root theorem to discover that fact.

The zeros are all nice; you can then use their multiplicity and the y-intercept to sketch the details.

I presume that at some point you will have read this:

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