19 -- For how many positive and negative integer values of $k$, does the inflection point of $y = kx^3 + (k+1)x^2$ lie in the second quadrant? (1) $1$ (2) $2$ (3) more than $2$ (4) zero
\textbf{19 --} For how many positive and negative integer values of $k$, does the inflection point of $y = kx^3 + (k+1)x^2$ lie in the second quadrant?
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(1) $1$ \hfill (2) $2$ \hfill (3) more than $2$ \hfill (4) zero
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