How do you simplify $3 [\sqrt{20}] (2 [\sqrt{5}] - 7)$ $3[sqrt20](2[sqrt5] - 7)$ ?

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Answer 1 · 2018-04-16T21:47:18

$60 - 21 \sqrt 20$ $60-21√20$

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$6 \sqrt (20 \cdot 5) - 21 \sqrt 20$ $6√(20*5)-21√20$
$6 \cdot 10 - 21 \sqrt 20$ $6*10-21√20$
$60 - 21 \sqrt 20$ $60-21√20$

How do you simplify 3[sqrt20](2[sqrt5] - 7)3[√20](2[√5]−7) 3[sqrt20](2[sqrt5] - 7)?