Evaluate the following cube root
$\sqrt[3]{{ - 2\dfrac{{10}}{{27}}}}$
Answer
689.4k+ views
Hint:- In this question we have given $\sqrt[3]{{ - 2\dfrac{{10}}{{27}}}}$ So the key concept is that first simplify the inner part of the cube root by using the concept of fraction and then apply the cube root.
Complete step-by-step answer:
Now consider the given expression
$
\Rightarrow \sqrt[3]{{ - 2\dfrac{{10}}{{27}}}} \\
\Rightarrow \sqrt[3]{{ - \dfrac{{64}}{{27}}}} \\
\Rightarrow \sqrt[3]{{ - {{\left( {\dfrac{4}{3}} \right)}^3}}} \\
\Rightarrow \sqrt[3]{{( - 1) \times {{\left( {\dfrac{4}{3}} \right)}^3}}} \\
$ ………… (1)
Now taken $\dfrac{4}{3}$ outside of cube root from equation (1) we get,
$ \Rightarrow \dfrac{4}{3} \times \sqrt[3]{{ - 1}}$ ………. (2)
And we can write $ - 1 = {\left( { - 1} \right)^3}$ in equation (2) we get,
$
\Rightarrow \dfrac{4}{3} \times \sqrt[3]{{{{\left( { - 1} \right)}^3}}} \\
\Rightarrow \dfrac{4}{3} \times ( - 1) \\
\Rightarrow - \dfrac{4}{3} \\
$
Hence the answer is $ - \dfrac{4}{3}$ .
Note :- Whenever we face such types of problems the key concept is to simplify the given expression in-to-out which means that first solve the inner part and then simplify the cube root part of the expression to get the right answer.
Complete step-by-step answer:
Now consider the given expression
$
\Rightarrow \sqrt[3]{{ - 2\dfrac{{10}}{{27}}}} \\
\Rightarrow \sqrt[3]{{ - \dfrac{{64}}{{27}}}} \\
\Rightarrow \sqrt[3]{{ - {{\left( {\dfrac{4}{3}} \right)}^3}}} \\
\Rightarrow \sqrt[3]{{( - 1) \times {{\left( {\dfrac{4}{3}} \right)}^3}}} \\
$ ………… (1)
Now taken $\dfrac{4}{3}$ outside of cube root from equation (1) we get,
$ \Rightarrow \dfrac{4}{3} \times \sqrt[3]{{ - 1}}$ ………. (2)
And we can write $ - 1 = {\left( { - 1} \right)^3}$ in equation (2) we get,
$
\Rightarrow \dfrac{4}{3} \times \sqrt[3]{{{{\left( { - 1} \right)}^3}}} \\
\Rightarrow \dfrac{4}{3} \times ( - 1) \\
\Rightarrow - \dfrac{4}{3} \\
$
Hence the answer is $ - \dfrac{4}{3}$ .
Note :- Whenever we face such types of problems the key concept is to simplify the given expression in-to-out which means that first solve the inner part and then simplify the cube root part of the expression to get the right answer.
Recently Updated Pages
Explain the Treaty of Vienna of 1815 class 10 social science CBSE

10 examples of friction in our daily life

Draw a diagram of nephron and explain its structur class 11 biology CBSE

Write structures of the following compounds i 2 Chloro3methylpentane class 11 chemistry CBSE

A Paragraph on Pollution in about 100-150 Words

XIX+XXX A 49 B 51 C 55 D 44 class 5 maths CBSE

Trending doubts
What is BLO What is the full form of BLO class 8 social science CBSE

Citizens of India can vote at the age of A 18 years class 8 social science CBSE

Full form of STD, ISD and PCO

Write an article on Global warming in about 200 words

What are the methods of reducing friction. Explain

Write a letter to the Municipal Commissioner to inform class 8 english CBSE


