Question

Rezolvati ecuatia:√x²+1=2

Answer 1

$\sqrt{x^2+1} =2 \\ \\ x^2+1=4 \\ \\ x^2=4-1 \\ \\ x^2=3 \\ \\ x= \sqrt{3} ;- \sqrt{3} \\ \\ \\ \\ \sqrt{x^2} +1=2 \\ \\ / x/=2-1 \\ \\ x=+1;-1$