The code:

syms x y;

Z $=2*$x$^3-5*$x$^2-9$;

G $=$ subs$($Z$,$x$,($y$-2))$ gives:

Select one:

a$.$

G $=-45$

b$.$ G $=2*($y $-2)^3-5*($y $-2)^29$

c$.$

None of the given choices

d$.$

G$=2*$y$^3-5*$y$^29$