Shares of Nutanix Inc (NASDAQ:NTNX) continued to take a beating after the company announced poor earnings and guidance last Thursday. Friday, the stock dropped 25% and Monday another 7%. As of the close on Monday, Nutanix ended at $21.31. Investors are chomping at the bit to buy the stock but smart investors are carefully calculating the final downside target before putting their hard earned money at risk. To calculate the target investors should use a technique called symmetry. To do this, take the last big fall that took place back in October to early November 2016. The stock fell from $46.75 to a final low of $23.15. This was a drop of 50.50%. The high, just before the latest collapse was $34.00. Symmetry dictates that Nutanix Inc should fall 50.50% from $34.00 to its final target. Once calculated out, this gives investors a major buy level at $17.18. This mean that Nutanix still has quite a big of downside from its current price of $21.31 before it gets to $17.18, the smart investor buy level.