Ajutooor!!! Dau COROANĂĂĂĂ!!!

Salut!
Ai ca xV = 5/2;
Insa xV = -b/(2a);
Asadar, (4m+1)/2 = 5/2
<=> 4m+1 = 5 <=>
4m = 4;
m = 1.
Bafta!