Thread: factor theorem
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Old January 5th, 2009, 04:04 PM
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Quote:
Originally Posted by fanfan1609 View Post
After factorising . I have f(x)=(x-3).(2x+1).(2x-3).(x+1)
If x belongs (3/2,3) ,f(x) <0 .Example x=2 ,I have f(2)=(2-3).(2.2+1).(2.2-3).(2+1)=(-1).5.1.3=-15
I thinks so that .
2x^2 - 5x - 3 \neq (2x - 3)(x+1).

If you had expanded as a check you would have noticed this.
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