Question

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$- 4 \sqrt{5} + 2 \sqrt{28} + 3 \sqrt{20} - 6 \sqrt{5}$
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Answer 1

Explicação passo a passo:

$-4\sqrt{5}+2\sqrt{28}+3\sqrt{20}-6\sqrt{5}$

fatorando o 28 = 2² · 7 e o 20 = 2² · 5, substitua

    $-4\sqrt{5}+2\sqrt{2^{2}.7}+3\sqrt{2^{2}.5}-6\sqrt{5}$

    $-4\sqrt{5}+2.2\sqrt{7}+3.2\sqrt{5}-6\sqrt{5}$

    $-4\sqrt{5}+4\sqrt{7}+6\sqrt{5}-6\sqrt{5}$

    $-4\sqrt{5}+4\sqrt{7}$