Question

ormula1" title="(\sqrt{20} - 2\sqrt{45} +\sqrt{5} )*\sqrt{5}" alt="(\sqrt{20} - 2\sqrt{45} +\sqrt{5} )*\sqrt{5}" align="absmiddle" class="latex-formula">

Answer 1

Answer:

-15

Step-by-step explanation:

$(\sqrt{20} - 2\sqrt{45} +\sqrt{5} )*\sqrt{5}$

$= \sqrt{20} \times \sqrt{5} - 2 \sqrt{45} \times \sqrt{5} + \sqrt{5} \times \sqrt{5}$

$= \sqrt{100} - 2 \sqrt{225} + \sqrt{25}$

= 10 - 2 × 15 + 5

= 10 - 30 + 5

= 15 - 30

= -15 (Ans)