I have made a standard curve. The X-axis is logarithmic. The y-axis is linear.I have added a logarithmic trendline (y = -1.546ln(x) + 39.254; R = 0.9906).How can I re-arrange the equation to calculate an unknown X-axis value?
How do I extrapolate data from a NON-LINEAR (logarithmic) standard curve in Excel?
nonlinear equations;nonlinear algebra