What is the range of the function $f(x) = 3- 2\cdot 51^x$? Give your answer as an interval.
f(x) = 3 - 2(51)x
2(51)x > 0
So, -2(51)x < 0
3 - 2(51)x < 3
Range = (-∞, 3)
+2 
