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# How to know whether something factorises watch

1. I know it is something to do with b^2=4ac but I cant remember exactly what it is! Help please?
2. b^2 - 4ac is the determinant and tells you whether the equation has any real roots, not whether it factorises or not
3. You're trying to factorise a quadratic? It will factorise iff b^2-4ac is a perfect square. But by factorise we sort of mean into nice integer factors. So then you learn that if b^2>=4ac then the quadratic has real roots, so will factorise into those, even if they have nasty square-root surd kind of things.

And then you do FP1 and realise that any quadratic factorises really, if you allow complex numbers. Good subject, maths.
4. Thanks folks! So I take it 6x^2-6x+2 isnt factorising?
5. (Original post by lefneosan)
Thanks folks! So I take it 6x^2-6x+2 isnt factorising?
You can obviously take a 2 out. But unless you're doing Further Maths A level, the answer is 'it doesn't factorise'
6. Serious descrimination but the help is worth it! thanks!

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