Given that x-1 and x+2 are factors of f(x)= x^3 + px + q where p and q are integers, find p and q. How do i start in find p and q????
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If is a factor, then
so wait if i use x-1 then where x is, it would be replaced by 1, F(1) = 1^3 + p(1) + q and i was just end up where i started, so how to advance on this questions , and thanks
This gives you one equation in and . Now find another using the other factor.
then i simultaneously solve right??? thanks alot your help greatly appreciated,
Another method: We know k is real as complex roots come in conjugate pairs. Now equate coefficients.
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