If k and 2k are zeros of f(x)=x3+4x2+9kx=90, find k and all three zero

1.	If k and 2k are zeros of f(x)=x3+4x2+9kx=90, find k and all three zeros of f(x).
Answer» If k and 2k are zeros of $f (x) = x^{3} + 4 x^{2} + 9 k x = 90$ , find k and all three zeros of f(x).

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