Question

$\sqrt{2} \times - \sqrt{2}$
​

Answer 1

$\sqrt{2} \times ( - \sqrt{2} ) \\ \\ = \sqrt{2} \times ( - 1) \times ( \sqrt{2)} \\ \\ = ( - 1) \times \sqrt{2} \times \sqrt{2} \\ \\ = ( - 1) \times \sqrt{2 \times 2} \\ \\ = ( - 1) \times \sqrt{4} \\ \\ = ( - 1) \times 2 \\ \\ = - 2$