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Polynomial division Watch

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    given that -1 is a root of the equation 2x^3-5x^2-4x+3, find the two positive roots.
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    If -1 is a root then a factor would be : (x _ 1) <--- (decide what sign goes in the space). Then, you would long divide using the factor to split the cubic equation into a binomial and a quadratic. Factorise the quadratic and you're done.
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    I'm assuming that the equation is equal to 0.
    Use the factor theorem, (x-p) = 0 where p is the root.
    What I'd do is find the factor and divide it by the whole equation.
    It will lead you to a quadratic which you can factorise to find the other two roots .
 
 
 
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