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

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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