-1.1% is the decrease in cost
Answer:
8x^2 +5x -3
Step-by-step explanation:
(3x^2-2)+(5x^2+5x-1)
I like to line them up vertically
3x^2 -2
+5x^2+5x-1
------------------------
8x^2 +5x -3
Put n=2 ,
f(2+1) = f(2) => f(3) = f(2) = 9
now, put n=1,
f(1+1) = f(1) => f(2) = f(1) = 9