SOLUTION: If a2 = 2a1 + 3 and a3 = 4a2 + 3 then in terms of a1, a1 + a2 + a3 =

Algebra ->  Sequences-and-series -> SOLUTION: If a2 = 2a1 + 3 and a3 = 4a2 + 3 then in terms of a1, a1 + a2 + a3 =      Log On


   

Question 885192: If a2 = 2a1 + 3 and a3 = 4a2 + 3 then in terms of a1, a1 + a2 + a3 =
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
let
a=a1
b=a2
c=a3
b=2a + 3
c=4b + 3
z=a+b+c
z=a+2a+3+4b+3
z=a+2a+3+4(2a+3)+3
z=a+2a+3+8a+12+3
z=a+2a+3+8a+12+3
z=11a+18
a1 + a2 + a3 =11a1+18