Find the value of the equation :
$7 x^{3} + x^{4} + x$ , if $x = 7$

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Solution

Consider the given equation.

$7 x^{3} + x^{4} + x$

Since, $x = 7$

So,

$= 7 {(7)}^{3} + {(7)}^{4} + 7$

$= 7 \times 343 + 2401 + 7$

$= 2401 + 2408$

$= 4809$

Hence, this is the answer.

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