title: Fitting data in least square sense to nonlinear equation
body: <p>I need help fitting data in a least square sense to a nonlinear function. Given data, how do I proceed when I have following equation?</p>
  
  <p>f(x) = 20 + ax + b*e^(c*2x)</p>
  
  <p>So I want to find a,b and c. If it was products, I would linearize the function by takin the natural logaritm all over the function but I can not seem to do that in this case. </p>
  
  <p>Thanks</p>