Question

Simplify: $\sqrt{169}\times \sqrt{361}$

Answer 1

Given number is $\sqrt{169}\times \sqrt{361}$

Now, $169=13\times 13={13}^2⟹\sqrt{169}=\sqrt{{13}^2}=13$

Also, $361=19\times 19={19}^2⟹\sqrt{361}=\sqrt{{19}^2}=19$

Thus, $\sqrt{169}\times \sqrt{361}=13\times 19=247$