HP PRIME solves a equation wrongly

[Nigel (UK)]

(05-07-2023 01:23 AM)Williams369 Wrote:  We write in the CAS

"csolve(((x+400)*0.8/(π*0.04^4/32)) = (0.4*((x+400)*0.8/(π*0.04^4/32)+x*0.5/(0.141*(20*√2)^4*10^-12))),x)" RESULT −1661.90655858

"zeros(((x+400)*0.8/(π*0.04^4/32)) = (0.4*((x+400)*0.8/(π*0.04^4/32)+x*0.5/(0.141*(20*√2)^4*10^-12))),x)" RESULT −1661.90655858


"fsolve(((x+400)*0.8/(π*0.04^4/32)) = (0.4*((x+400)*0.8/(π*0.04^4/32)+x*0.5/(0.141*(20*√2)^4*10^-12))),x)" RESULT 2492.85983787

The correct answer is the one provided by fsolve. Why is this so? Why is HP Prime wrong when solving a simple equation of the first degree?

Using the web version of Xcas (solve(...,x)) gives the correct answer, whereas the Prime does not.

Nigel (UK)