Question

dau coroana ❤ +5 stele la raspunsurile bune​

Answer 1

2.

$\it 2x^2=98|_{:2}\ \Rightarrow\ x^2=49\ \Rightarrow\ \sqrt{x^2}=\sqrt{49}\ \Rightarrow\ |x|=7\ \Rightarrow\ x=\pm7\ \Rightarrow\ \\ \\ \ \Rightarrow\ x\in\{-7,\ 7 \}$