The formula gives an = 4* an-1
we can find every next term using previous term
when we place n=1
a1 = -9 let us find a2
a2= 4* a1 = 4*(-9 )= -36
a3 = 4* a2 = 4* (-36)=-144
a4= 4*a3= 4*-144=-576
a5= 4*a4 = 4*-576= -2304
a6 = 4*a5 = -9216
a7= 4*a6= -36864
So option A is the correct answer