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Power Law

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Question

Find the value of $15 x^{7} + x^{6} + x$ if $x = 7$

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Solution

$15 x^{7} + x^{6} + x$ if $x = 7$
$= 15 \times 7^{7} + 7^{6} + 7$
$= 15 \times 823543 ‬ + 117649 ‬ + 7$
$= 1, 23, 53, 145 + 1, 17, 649 ‬ + 7$
$= 1, 24, 70, 801$

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