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Cube Root of a Cube Number Using Estimation

On substituti...

Question

On substituting $x = 3$ , find the value of the expression $x^{3} + 5 x$ .

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Solution

$x^{3} + 5 x$
At $x = 3$
$= 3^{3} + 5 (3)$
$= 27 + 15$
$= 42$ (Answer)

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Cube Root of a Cube Number Using Estimation

Standard VIII Mathematics

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