Question

If $\sqrt{2}=1.4$ then $\sqrt{50}-\sqrt{18}$ is ___

Answer 1

Given: $\sqrt{2}=1.47$

$\sqrt{50}-\sqrt{18}$ = $\sqrt{2\times 25}-\sqrt{2\times 9}$

= $(\sqrt{2}\times \sqrt{25})-(\sqrt{2}\times \sqrt{9})$

=$(1.4\times 5)-(1.4\times 3)$

= $7.0-4.2$

= $2.8$