Problems with fsolve

[Ciucciuwaa]

Hi everyone,

i was trying to solve this formula but my calculator doesn't not work as always. It appears 'fsolve' and I don't know how to solve it. Can you help me and explain me what this 'fsolve' is?

ps: I had Hp prime app on my computer and it can solve the formula. The problem is just on my calculator.

[Joe_Horn]

CAS is optimized for EXACT math, but including decimal points always throws CAS into approximate mode.  So I suggest keying your input exactly, without using any decimal points.  This returns the exact solution, which you can easily approximate if you wish by pressing the [a b/c] key, as shown in the following screen capture.

[Ciucciuwaa]

I recently have done the upgrade and before that, it never happend. I wrote the equation without any attention for decimals. there is a way to turn back at this way to write equations? 

thank you so much for your help, now I understand the problem!