The maximum value of $f (x) = x^{2} + 7 x + 9$ is

\frac{13}{4}

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Infinity

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9

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- \frac{13}{4}

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Solution

The correct option is B Infinity
$f (x) = x^{2} + 7 x + 9, a = 1 > 0$

$\Rightarrow$ Minimum value is $\frac{4 a c - b^{2}}{4 a}$ and maximum value is infinity.

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