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**RickyOswaldIOW****Member**- Registered: 2005-11-18
- Posts: 212

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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**RickyOswaldIOW****Member**- Registered: 2005-11-18
- Posts: 212

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

Aloha Nui means Goodbye.

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**mathsyperson****Moderator**- Registered: 2005-06-22
- Posts: 4,900

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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