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March 3, 2015

March 3, 2015

Posted by **ladybug** on Monday, October 1, 2012 at 11:57pm.

f(x)=x^4+7x^3-x-2

every real zero of f lies between - ? and ?

- pre-calculus -
**Reiny**, Tuesday, October 2, 2012 at 10:11amx^4+7x^3-x-2 = 0

no simple way to solve this, so ....

Wolfram says:

http://www.wolframalpha.com/input/?i=x%5E4%2B7x%5E3-x-2+%3D+0

real roots are -6.99 and .705

There are only those two real roots, so there are no other real roots between ....

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