Question

Rezolvati in R ecuatia bipatrata
xla a 4- 5x²+4=0
Urgenttt.....

Answer 1

Notam x la a2a cu y y la a 2 -5y+4=0 delta=25-4×4=9 rezulta rad din delta =3 y1,2=(-b plusminus rad din delta )/2×a y1=(5+3)/2=4 y2=(5-3)/2=1 x la a 2a=4 deci x= plusminus 2 x la a 2 a=1 decu x=plusminus 1 S={-2,-1,1,2}