Question

If a1 = 6 and an=-5an-1 + 4 then find the value of a4. dont have much time please

Answer 1

-666

Explanation:

a1 = 6

an = -5 an-1 +4

a2 = -5 a1 +4 = -5*6 +4 = -30 +4 = -26

a3 = -5 a2 +4 = -5 (-26) +4 = 130+4 = 134

a4 = -5 a3 +4 = -5 (134) +4 = -670+4 =-666