Find the product. (z2+5z-4)(z2-2z-3)
a. z4-2z3-10z2+15z+12
b. 2z4+3z3-3z2-8z+12
c. z4+3z3-17z2-7z+12

z = -1

z = -4

this might be the answer correct me if im wrong if im right pls mark as brainiest

step-by-step explanation:

b. 2z4+3z3-3z2-8z+12

see explanation

step-by-step explanation:

since the sequence is geometric there is a common ratio r between consecutive terms, that is

r = 4 ÷ - 2 = - 2

r = - 8 ÷ 4 = - 2

r = 16 ÷ 8 = - 2

the next term - 13 must be incorrect as it should be - 32 for the sequence to be geometric.

the first 4 terms are therefore geometric with common ratio r = - 2

a

step-by-step explanation: