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Help 6

 Feb 27, 2018
 #1
avatar+99659 
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[ a^2 -2a - 3 ]              [ a^2  - 5a - 6 ]

___________    -      ______________

[a^2 - 9a + 18]            [ a^2 + 9a + 8 ]

 

 

(a - 3) ( a + 1)             (a - 6) ( a + 1)

___________    -       ____________

(a - 3) ( a - 6)              (a + 8) ( a + 1)

 

 

(a + 1)                       (a - 6)

_____         -           ______

(a - 6)                       (a + 8)

 

 

(a + 1) (a + 8)  - (a - 6)(a - 6)

______________________

(a - 6) ( a + 8)

 

 

[  (a^2 + 9a + 8) - ( a^2 - 12a + 36) ]

_________________________________

(a - 6)  ( a + 8)

 

 

  [ 21a -  28 ]

___________

(a - 6) (a + 8)

 

 

 

7. The denominator is    (1 + 3x) /x

 

Flip this and multiply by the numerator

 

   4                    x

____    *       _______

x + 3             (1 + 3x)

 

 

      4x

___________

3x^2 + 10x + 3

 

 

cool cool cool

 Feb 27, 2018
edited by CPhill  Feb 27, 2018

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