Given $f (x) = x (- 6)$ , how do you find $f (9)$ ?

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Solution

Find the value of $f (9)$ :
Given expression is $f (x) = x (- 6)$ .
Substitute $x = 9$ in the expression.
$\begin{array}{rcl} f (9) & = & 9 (- 6) \\ = & - 54 \end{array}$
Hence, the value of $f (9) = - 54$

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