(35s 42s/DM42 50G) Quadratic formula

[John Keith]

(05-04-2023 09:02 PM)mchris Wrote:  50g

Code:

« 3 PICK / 3 ROLLD SWAP / 2 / NEG DUP SQ ROT – √ DUP2 + EVAL 3 ROLLD – EVAL »

On the HP 49 and HP 50, 3 PICK can be replaced by PICK3, and 3 ROLLD can be replaced by UNROT. Each of those changes saves 2.5 bytes and a small amount of time.

Also, on the 28 and 48, ROT ROT is faster than 3 ROLLD. This only matters inside a loop but it may be useful to know.