Factor Completely $10 s^{2}+29 s-21$ (B) $z^{3}-1$ (C) $2 x^{2}-x y-6 y^{2}$ (D) $x^{2} y^{2}-9 x^{2}-4 y^{2}+36$

Factor completely.
(a) $10 s^{2}+29 s-21$
(b) $z^{3}-1$
(c) $2 x^{2}-x y-6 y^{2}$
(d) $x^{2} y^{2}-9 x^{2}-4 y^{2}+36$