Hi; got this question Given that x -2 is a factor of the polynomial x^3 - kx^2 -24x + 28, find k. I get k=-3 they get k=3. Pretty sure I'm right just need confirmation. Thanks.
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confirm it yourself ... $\displaystyle f(x) = x^3 + 3x^2 - 24x + 28$ if $\displaystyle k = -3$ or $\displaystyle f(x) = x^3 - 3x^2 - 24x + 28$ if $\displaystyle k = 3$ which one yields $\displaystyle f(2) = 0$ ?
Got it thanks Skeeter its the top one.
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