find a bound on the real zeros of the polynomial functions.
f(x)=x^4+7x^3-x-2
every real zero of f lies between - ? and ?
x^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 ....