Find the value of the polynomial $x^{2} + 2 x + 5$ when, $x = a$

a^{2} - 2 a - 2

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a^{3} + 2 a + 4

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a^{2} + a + 5

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a^{2} + 2 a + 5

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Solution

The correct option is D $a^{2} + 2 a + 5$
Let $f (x) = x^{2} + 2 x + 5$
When $x = a$ ,
$f (a) = a^{2} + 2 (a) + 5$
$= a^{2} + 2 a + 5$

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