Question

Find the value of 3√45 - √125 + √20 - √80 .

Answer 1

1. Answer: - 21435742.

Step-by-step explanation:i willnt tell

Answer 2

$\huge\underline\mathfrak{Given\::}$

$\longrightarrow$ $3\sqrt{45} - \sqrt{125} + \sqrt{20} - \sqrt{80}$

$\huge\underline\mathfrak{Solution\::}$

$\longrightarrow$ $3\sqrt{45} - \sqrt{125} + \sqrt{20} - \sqrt{80}$

$\Rightarrow 3\sqrt{9\times 5} - \sqrt{25\times 5} + \sqrt{4\times 5} - \sqrt{16\times 5}$

$\Rightarrow$ $3\sqrt{9}\sqrt{5} - \sqrt{25}\sqrt{5} + \sqrt{4}\sqrt{5} - \sqrt{16}\sqrt{5}$

$\Rightarrow$ $3\times{3}\sqrt{5} - 5\sqrt{5} + 2\sqrt{5} - 4\sqrt{5}$

$\Rightarrow$ $9\sqrt{5} - 5\sqrt{5} + 2\sqrt{5} - 4\sqrt{5}$

$\Rightarrow$ $4\sqrt{5} + 2\sqrt{5} - 4\sqrt{5}$

$\Rightarrow$ $6\sqrt{5} - 4\sqrt{5}$

$\Rightarrow$ $2\sqrt{5}$

$\therefore$ $The\: answer\: of\: this\: question\: is\: 2\sqrt{5}$