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http://www.jiskha.com/display.cgi?id=1276043019
f(x) = x3 + 2x2 – 0.4X – 1
how do you you factor this?
2 answers
Please use ^ before exponents.
There is no simpl standard formula for finding the roots of cubic equations. First create integer coefficients by rewriting as
(1/5) (5x^3 + 10x^2 -2x -5)
There are no simple factors with integers for this equation. That can be proven with something sometimes called the "p/q theorem". It can be faotored to
f(x) = 5[(x-0.689)(x+1.941,(x+0.748)]
I used an online solver for that.
The numbers in the factors are rounded.
There is no simpl standard formula for finding the roots of cubic equations. First create integer coefficients by rewriting as
(1/5) (5x^3 + 10x^2 -2x -5)
There are no simple factors with integers for this equation. That can be proven with something sometimes called the "p/q theorem". It can be faotored to
f(x) = 5[(x-0.689)(x+1.941,(x+0.748)]
I used an online solver for that.
The numbers in the factors are rounded.