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#1 2005-11-28 05:18:02
- RickyOswaldIOW
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- Registered: 2005-11-18
- Posts: 212
More factorising revision
Factorising quadratics that is;
I have y = 2 - 3x - 2x^2.
Normally I would take out the coefficient of x^2 and thus have;
y = -2[x^2 + 1(1/2) - 1]
But I can't seem to factorise this?...
Aloha Nui means Goodbye.
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#2 2005-11-28 05:21:53
- RickyOswaldIOW
- Member
- Registered: 2005-11-18
- Posts: 212
Re: More factorising revision
Okay, maybe I should not take the 2 from the x^2 and instead have;
-[2x^2 + 3x - 2].
I think this will work but I have to go out now, thanks anyway 
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#3 2005-11-28 06:08:15
- mathsyperson
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- Registered: 2005-06-22
- Posts: 4,900
Re: More factorising revision
That would work. -[2x² + 3x - 2] factorises to give -(x+2)(2x-1).
Why did the vector cross the road?
It wanted to be normal.
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