Question

ajutor
 3*$x^{2}$-0.7=-0.22

Answer 1

$3x^2-0,7=-0,22 \\ 3x^2=-0,22+0,7 \\ 3x^2=0,48 \\ x^2=0,48:3 \\ x^2=0,16 \\ x= \sqrt{0,16} \\ x=0,4 \\ x=- \sqrt{0,16} \\ x=-0,4 \\ S=\{-0,4;0,4\}$