Question

Aflați numerele reale a si b care au suma 1 si produsul -12

Answer 1

a= 4 
b= -3

 4+(-3)= 1

4*(-3)= -12

Answer 2

a+b=1 =>a=1-b; a*b=-12=> b-b²=-12 => b²-b-12=0; Δ=1+48=49; √Δ=7.=> b1=(1+7)/2=4 si b2=(1-7)2=-3 => a1=-3 si a2=4