Question

AYUDA URGENTE por favor
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Answer 1

$6\sqrt{20}-4\sqrt{500} +3\sqrt{125} \\6\sqrt{4.5}-4\sqrt{100.5} +3\sqrt{25.5}\\6\sqrt{4}.\sqrt{5}-4\sqrt{100}.\sqrt{5} +3\sqrt{25}.\sqrt{5}\\6.2\sqrt{5}-4.10\sqrt{5} +3.5\sqrt{5}\\ 10\sqrt{5}-40\sqrt{5} +15\sqrt{5} \\\sqrt{5}(10-40+15)\\\sqrt{5} (-30+15)=-15\sqrt{5}$