Old guy helping daughter
We have no book and I am trying to go through example problems. I probably need to get a book and learn this all over again. 50 years old no and not done this since 20 years old.
(2x-2)(1x-1) gets me 4x in the middle when I multiply it through.
Is this the right way to approach this, did I do something silly?
Since your factoring. I would think that you would factor a 2 out of the whole problem. I don't know what would go into 1 and add up to -4 though. So my post is basically useless.
Originally Posted by jonb
Factor out a 2(x^2-4x+1)
That's because nothing does. You can tell if a quadratic has integer factors by looking at the discriminant,
Originally Posted by Matrim
[tex]\Delta = b^2-4ac = 16-(4)(1)(1) = 12[/tex]. As 12 is not a square number this does not have integer factors and your factorisation is as far as it goes although the 2 can be cancelled
Can anyone recommend a book to relearn all of this?