IGCSE/GCSE/O & A Level/IB/University Student Forum

Qualification => Subject Doubts => IGCSE/ GCSE => Math => Topic started by: Diablo on November 22, 2009, 03:54:10 pm

Title: Factorization
Post by: Diablo on November 22, 2009, 03:54:10 pm

What's the best and fastest way to factorize 4x(squared)-11x+6  :D :D

answer is (4x-3)(x-2)

what do you guys think?

Title: Re: Factorization
Post by: AS girl on November 22, 2009, 04:09:59 pm

4x(squared)-11x+6
a=4,b=-11,c=6
1) get the value of ac
4*6=24

2) get the factors of 24...when u multiply it together u get 24, when added u get b...which is (-11)

3) factors are -8*-3

4) plug these factors in the orginal equation

4x(squared)-8x-3x+6

5) factorise... 4x(squared)-8x=====> 4x(x-2)
                   -3x+6============>-3(x-2)

6) collect terms... (x-2)(4x-3)


Hope u understood :) 

Title: Re: Factorization
Post by: Diablo on November 22, 2009, 06:09:38 pm

2na ba3ed I solve it using this method  :-\ But I feel like it's really slow and stuff, isn't there any "shortcut" to these kind of polynomials besides using the calculator  :D

Bes shokran AS Girl :)

Title: Re: Factorization
Post by: AS girl on November 22, 2009, 06:17:26 pm

Quote from: Diablo on November 22, 2009, 06:09:38 pm

2na ba3ed I solve it using this method  :-\ But I feel like it's really slow and stuff, isn't there any "shortcut" to these kind of polynomials besides using the calculator  :D

Bes shokran AS Girl :)

7a'9reen l 6aybeen ;) By the way this is the easiest way...by practising it becomes easier...so 7awly to solve as much as u can...

there's another way..trial and improvement,,,wastes even more time than this way :P

Title: Re: Factorization
Post by: Diablo on November 24, 2009, 02:27:29 pm

Yeah, I agree.

By the way it's 7awl (i'm a guy XD)

Title: Re: Factorization
Post by: ~~~~shreyapril~~~~ on November 30, 2009, 03:39:42 pm

correct and... By the way diabo ur name itself tells u a guy no girl can keep such name :P