Math 209

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f(x) = x3 + 2x2 – 0.4X – 1

how do you you factor this?

  • Math 209 -

    Do not repost a question which has been answered.

    http://www.jiskha.com/display.cgi?id=1276043019

  • Math 209 -

    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.

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