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Finding Squares of Numbers

2 2.001 3 + ...

Question

$2 (2.001)^{3} + 7 (2.001) + 1 = ?$

13.13

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31.31

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13.013

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31.031

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Solution

The correct option is D $31.031$
On simplifying, we get,
$2 (2.001)^{3} + 7 (2.001) + 1$
$= (2 \times 8.012) + 14.007 + 1$
$= 16.024 + 14.007 + 1$
$= 31.031$ .
Hence, option $D$ is correct.

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