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If f:ℕ→ℝ is a...

Question

If $f : N \to R$ is a function defined as $f (x) = 2 x^{2} + 1$ , then the image of $5$ under $f$ is

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Solution

Here, $f (x) = 2 x^{2} + 1$
Put $x = 5$ in $f (x)$ , we get
$f (5) = 2 (5)^{2} + 1$
$\Rightarrow f (5) = 51$
Image of $5$ under $f$ is $51.$

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