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C1 - Factorising cubics watch

1. http://www.ocr.org.uk/Images/57769-q...hematics-1.pdf

Last part to 10

It is only worth two marks how would you solve this without doing in to the factor theorem etc.

I know ( x - 1/2 ) is a factor because it tells you in the question at the point x = 1/2 has a tangent... How would you work out the other two brackets?
2. You are supposed to sketch this.

Sketch the cubic and show the tangent.

Note that the tangent crosses the cubic one more time.

What does that tell you?

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Updated: April 8, 2013
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