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

9

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\frac{13}{4}

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- \frac{13}{4}

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not defined

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Solution

The correct option is D not defined
$f (x) = x^{2} + 7 x + 9, a = 1 > 0$

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

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Similar questions

f (x) = x^{2} + 7 x + 9

f (x) = \frac{x}{1 + 4 x + x^{2}}

f (x) = \frac{x^{2} - x + 1}{x^{2} + x + 1}

f (x) = x^{2} - 7 x + 10

f (x) = x^{3} + 5 x^{2} - 7 x + 9 = 0

x = 1.1

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