Question

se considera functia f (x) =x patrat-2.determinati numerele reale a stiind ca f (a) =a

Answer 1

f(a)=a^2-2

a^2-2=a

a^2-a-2=0

delta=1+8=9

a1=(1+3)/2=4/2=2

a2==(1-3)/2=-2/2= -1

a={-1,2}