$15 x^{3} + x^{2} + x = ?$ if $x = 7$

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Solution

Putting $x = 1$

$15 \times 7^{3} + 7^{2} + 7 = 15 \times 343 + 49 + 7 = 5201$

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Similar questions

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

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