He had spent two hours trying to use Excel’s Goal Seek. It was slow, clunky, and kept crashing when the volatility spiked above 200%. He needed speed. He needed precision. He needed the Newton Raphson method.
Arjun’s eyes widened. He didn’t need calculus. He just needed two guesses. How To Code the Newton Raphson Method in Excel VBA.pdf
0.25 → 0.35 → 0.42 → 0.197 → 0.203 → 0.19999. He had spent two hours trying to use Excel’s Goal Seek