Maths help? Factorizing?

2009-10-29 10:44 am
6X squared+X-2
Working out too please cause i need to learn how to do this! Thanks =]
更新1:

Thanks, but how did you work it out because ive got a few to do and i need to understand them lol ^_^

更新2:

In this line 6x^2 + 4x - 3x - 2 where did you get the 4x - 3x from??

回答 (4)

2009-10-29 11:14 am
✔ 最佳答案
6x^2 + x - 2
= 6x^2 + 4x - 3x - 2
= (6x^2 + 4x) - (3x + 2)
= 2x(3x + 2) - 1(3x + 2)
= (3x + 2)(2x - 1)
2009-10-29 8:17 pm
6 x ² + x - 2

Trial and Error :-

( 3x------) ( 2 x ------ )

( 3x------2 ) ( 2 x ------1 )

( 3 x + 2 ) ( 2 x - 1 )
2009-10-29 6:42 pm
6x^2 + x - 2

Okay firstly you look at the final constant, - 2, and find values which multiply to give this. E.g. -2 and 1.

Then look at the constant in front of the x term, which is a 1.

Finally look at the combinations you can get 6x^2 from x terms e.g. 3x and 3x.

Then put it all together to get:
(3x - 2)(3x + 1)
the -2 and the +1 multiply to get -2, and the other terms make the required 1x.
2009-10-29 6:07 pm
factors: (3x+2)(2x-1)


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