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yuradex [85]
3 years ago
10

What is the following sum

Mathematics
2 answers:
Doss [256]3 years ago
8 0

Answer:

2nd option is the correct answer

12{b}^{2}    \bigg(\sqrt[3]{2a}  \bigg)

Step-by-step explanation:

3 {b}^{2}  \bigg( \sqrt[3]{54a}  \bigg) + 3 \bigg( \sqrt[3]{2a {b}^{6} }  \bigg) \\  \\  = 3 {b}^{2}  \bigg( \sqrt[3]{27 \times 2a}  \bigg) + 3 \bigg( \sqrt[3]{2a {( {b}^{2} )}^{3} }  \bigg) \\  \\  = 3 {b}^{2}  \bigg( \sqrt[3]{ {3}^{3} \times 2a}  \bigg) + 3 \bigg({\sqrt[3]{{( {b}^{2} )}^{3}2a}  }  \bigg) \\  \\  = 3 {b}^{2}  \times 3  \sqrt[ 3]{2a} + 3 {b}^{2}   \sqrt[3]{2a}  \\  \\  = 9 {b}^{2}  \sqrt[ 3]{2a} + 3 {b}^{2}   \sqrt[3]{2a}  \\  \\  = 12{b}^{2}    \bigg(\sqrt[3]{2a}  \bigg)

lisabon 2012 [21]3 years ago
6 0

Answer:

second option:  12b²(∛2a)

Step-by-step explanation:

you can break \sqrt[3]{54a} into \sqrt[3]{3^3(2a)} which equals 3\sqrt[3]{2a}

you can break \sqrt[3]{2ab^6} into \sqrt[3]{2ab^3b^3} which equals b²\sqrt[3]{2a}

now we can simplify: (3b² ·  3\sqrt[3]{2a}) + 3b²\sqrt[3]{2a} = 9b²\sqrt[3]{2a} + 3b²\sqrt[3]{2a}

this equals 12b²\sqrt[3]{2a}

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