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April 21, 2014

April 21, 2014

Posted by **Caylan** on Saturday, December 22, 2012 at 11:32pm.

f(x)=18x^4-8x^2+9x-1;[0,3)

can you please me how you got the answer

- calculus -
**Steve**, Sunday, December 23, 2012 at 5:29amf(0) = -1

f(3) > 0

so, to get from -1 to a positive value, it must pass through zero, because f is continuous.

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