Looking for the x of this polynomial

$\displaystyle x^3 + 3x^2 - 40 = 0$

I tried using the factor theorem but i cant find the value that makes it 0. f( ) = 0

x should = 2.66

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- Mar 29th 2011, 06:04 PMDevi09Finding x of this polynomial
Looking for the x of this polynomial

$\displaystyle x^3 + 3x^2 - 40 = 0$

I tried using the factor theorem but i cant find the value that makes it 0. f( ) = 0

x should = 2.66

- Mar 29th 2011, 06:07 PMProve It
It doesn't factorise, so you'll have to use a numerical method, like the bisection method or Newton's method.