Find the value of -125-1-125

The correct option is B 5.2 The given expression is √( 125 ) + 1/√( 125 ) √( 125) = √( 5 × 5× 5) = 5 The expression √( 125 ) + 1/√( 125 ) becomes 5 + 1 ...

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Standard VIII

Mathematics

Cube-Root of a Negative Perfect Cube

Find the valu...

Question

Find the value of $\sqrt[3]{- 125} + \frac{1}{\sqrt[3]{- 125}}$

5.2

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- 5.2

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- 4.8

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4.8

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Solution

The correct option is B
- 5.2

The given expression is $\sqrt[3]{- 125} + \frac{1}{\sqrt[3]{- 125}}$

$\sqrt[3]{- 125}$ = $\sqrt[3]{- 5 \times - 5 \times - 5}$ = -5

The expression $\sqrt[3]{- 125} + \frac{1}{\sqrt[3]{- 125}}$ becomes

$- 5 + \frac{1}{- 5}$

= - 5 - 0.2 = - 5.2

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Find the value of 3√−125+13√−125

The correct option is B - 5.2 The given expression is 3√−125+13√−125 3√−125 = 3√−5×−5×−5 = -5 The expression 3√−125+13√−125 becomes −5+1−5 = - 5 - 0.2 = - 5.2

Find the value of $\sqrt[3]{- 125} + \frac{1}{\sqrt[3]{- 125}}$

The correct option is B
- 5.2

The given expression is $\sqrt[3]{- 125} + \frac{1}{\sqrt[3]{- 125}}$

$\sqrt[3]{- 125}$ = $\sqrt[3]{- 5 \times - 5 \times - 5}$ = -5

The expression $\sqrt[3]{- 125} + \frac{1}{\sqrt[3]{- 125}}$ becomes

$- 5 + \frac{1}{- 5}$

= - 5 - 0.2 = - 5.2