If $p (x) = x^{2} - 5 x - 6$ ; find the value of $p (3)$

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Solution

Given, $p (x) = x^{2} - 5 x - 6$
$\Rightarrow p (3) = 3^{2} - 5 \times 3 - 6$
$\Rightarrow p (3) = 9 - 15 - 6$
$\Rightarrow p (3) = - 12$

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