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Shena123456 Shena123456
  • 06-08-2014
  • Mathematics
Answered

please help with the multiple choice: 
What are the x-intercepts of a rough sketch of f(x)=8x3−2x ?


   A  The x-intercepts are 0, 4 and -4
   B The x-intercepts are 0, 1/4 and -1/4
   C  The x-intercepts are 1/4 and -1/4 T
   D  he x-intercepts are 4 and -4

Verified Answer :

Everest2017
Everest2017 Everest2017
  • 06-08-2014

8 x³ - 2x  =  0
2x (4 x² - 1 )  = 0
2 x  (2x + 1) ( 2x - 1) = 0
x = 0 or x = -1/2  or x = 1/2

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