Thread: Exponential function - regularly spaced points

"An exponential function has f(8) = 13 and f(11) = 26. Find another value of f(x) using the pattern followed by regularly spaced points."

I found the equation is 2.05*1.26^x using my calculator, however I'm not sure how to use this showing work... ?

I would suggest using the model or

Either way substitute your two points in to solve A and b simultaneously.