can be factorised?

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- Nov 22nd 2009, 09:44 AMdecoy808factorise
can be factorised?

- Nov 22nd 2009, 09:51 AMskeeter
- Nov 22nd 2009, 10:01 AMRaoh
- Nov 22nd 2009, 10:11 AMRaoh
- Nov 22nd 2009, 10:17 AMukorov
split coefficient of , ie. 3, into its factors 3x and 1x. also split the constant -5 into -1 and +5

you will find that:

3 x -1 = -3

1 x +5 = +5

putting these two products together you have (-3) + (+5) = (+2), which is the coefficient of x. however when you fill up the brackets with these factors you don't write (3x - 1)(x + 5). You write (3x + 5)(x - 1).