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Pure Mathematics
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Topic Topic: Factorisation of quadratic expression Post ReplyNew Question
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System
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Joined: 26 June 2005
Posts: 918
Posted: 01 July 2005 at 8:28pm | IP Logged Quote System

QUIZ QUESTION #151
Factorise this quadratic expression:
  6x + 7x + 2
    A.   (x + 2)(6x + 1)
    B.   (2x + 1)(3x + 2)
    C.   (3x + 1)(2x + 2)
    D.   (6x + 7)(x + 1)
 QUIZ QUESTION #151 created by Zach on 01 July 2005 at 4:16pm

Correct answer: B    Correct clicks: 55.97%  Wrong clicks: 44.03%
 
    A.   [49 clicks 13.92%] 
 
    B.   [197 clicks 55.97%] 
 
    C.   [70 clicks 19.89%] 
 
    D.   [36 clicks 10.23%] 
 
Please discuss this quiz question.
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Tutor9688
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Joined: 13 August 2005
Location: Malaysia
Posts: 18
Posted: 13 August 2005 at 10:36pm | IP Logged Quote Tutor9688

b
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Tutor9688
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Joined: 13 August 2005
Location: Malaysia
Posts: 18
Posted: 13 August 2005 at 10:41pm | IP Logged Quote Tutor9688

6x^2 + 7x + 2

= (3x + 2) (2x + 1)

why ?

because (3x * 2x) = 6x^2

             (3x * 1)  = 3x

             (2 * 2x)  = 4x

             (2 * 1)   = 2

Total is : 6x^2 + 3x + 4x + 2

             = 6x^2 + 7x + 2

 

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