Here x=7 ∴ x^3=7× 7× 7=45× 7 =343 ∴ x^3+x^3+x=343+343+7 ∴ x^3+x^3+x=686+7 ∴ x^3+x^3+x=693 ...

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Finding the Value of an Expression

x3+x3+x=?if ...

Question

$x^{3} + x^{3} + x = ?$
if $x = 7$

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Solution

Here $x = 7$
$∴ x^{3} = 7 \times 7 \times 7 = 45 \times 7$
$= 343$
$∴ x^{3} + x^{3} + x = 343 + 343 + 7$
$∴ x^{3} + x^{3} + x = 686 + 7$
$∴ x^{3} + x^{3} + x = 693$

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Similar questions

x^{3} + 7 x^{2} + x =

x = 7

7 x^{3} + x^{3} + x = ?

x = 7

x + \frac{1}{x} = 7

x^{3} + \frac{1}{x^{3}}

If $x - \frac{1}{x} = 7,$ find the value of $x^{3} - \frac{1}{x^{3}}$ .

x - \frac{1}{x} = 7

x^{3} - \frac{1}{x^{3}}

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