Hi I need to implement a function $a+b\cdot 2^x$ in a highly resource constrained device. a and b are constants and x is a variable. How do I go about finding a simplified version of this expression so that I can get a value almost equal to it, without having to do multiplication, division or exponentiation? the result does not have to be exact, and I can find the new values for a and b empirically. Please help. Thank you
PS: please suggest some new tags for this question, I cannot think of any that are available currently