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# Graphs of curves Watch

1. I can do the first part easily as it factorises into (x-3) as a repeated root so it's Figure 3.

However for the other 2, I don't know how to do them, because they don't factorise cleanly so I don't know where they hit the x axis.
2. (Original post by WildBerry)
However for the other 2, I don't know how to do them, because they don't factorise cleanly so I don't know where they hit the x axis.
You could either complete the square (which tells you its turning point) and/or use the discriminant b²-4ac to figure out the number of roots to eliminate some graphs.
3. I'd think a) 3 . b) 2 . c) 5
4. Complete the square - means it's translated left by and up by

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Updated: December 26, 2010
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