Question

stiind ca x1 si x2 sunt radacinile ecuatiei xla 2 +3x+1=0 sa se calculeye x la a 2 si 1 jos + x la a 2 si 2 jos

Answer 1

$x^{2} +3x+1=0 \\ x^2_{1}+ x^2_{2}=( x_{1}+ x_{2})^2-2 x_{1} x_{2} \\ x_{1}+ x_{2}=-3; x_{1} x_{2}=1 \\ x^2_{1}+ x^2_{2} =(-3)^2-2*1=9-2=7$