Find the Mistake, Then Find the Correct Answer $\mathrm{x}: \mathrm{x}^{2}=50$ Line $1 \quad \sqrt{x^{2}}=\sqrt{50}$

Essay

Find the mistake, then find the correct answer.
Solve for $\mathrm{x}: \mathrm{x}^{2}=50$
line $1 \quad \sqrt{x^{2}}=\sqrt{50}$
line $2 \quad x=2 \sqrt{5}$ or $x=-2 \sqrt{5}$
line 3 The solution set is $\{2 \sqrt{5},-2 \sqrt{5}\}$ .