$\displaystyle p= \frac{4}{9}$\displaystyle p= \frac{4}{9}

$\displaystyle p= \frac{4}{7}$\displaystyle p= \frac{4}{7}

$p=-4$p=-4

$\displaystyle p= -\frac{4}{7}$\displaystyle p= -\frac{4}{7}