Evaluate f(12)=1/4(12)-3

$f (12) = \frac{1}{4} (12) - 3$

Cancel the common factor of $4$ .

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Factor $4$ out of $12$ .

$f (12) = \frac{1}{4} \cdot (4 (3)) - 3$

Cancel the common factor.

$f (12) = \frac{1}{4} \cdot (4 \cdot 3) - 3$

Rewrite the expression.

$f (12) = 3 - 3$

Subtract $3$ from $3$ .

$f (12) = 0$

Evaluate f(12)=1/4(12)-3

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