Question

Calcule:
A) 5 √¯9 - 3 ³ √¯8 = ?

B) √¯21 . 4 - 3 = ?

C) √¯6² + 8²

Answer 1

$a) \\ \\ 5 \sqrt{9} - 3 * \sqrt[3]{8} \\ \\ 5 * 3 - 3 * 2 \\ \\ 15 - 6 => 9$

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$b) \\ \\ \sqrt{21} * 4 - 3 \\ \\=>-3 +4 \sqrt{21}$

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$\sqrt{21} = 4,58 \ aproximadamente$

$-3 +4* 4,58 = - 3 + 18,32 => 15,32$

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$c) \\ \\ \sqrt{6^2} + 8^2 \\ \\ \sqrt{36} + 64 \\ \\ 6 + 64 => 70$