Algebra Examples

$f (x) = \frac{7 x - 4}{4 x - 12}$ at $x = 3$

Step 1

Replace the variable $x$ with $3$ in the expression.

$f (3) = \frac{7 (3) - 4}{4 (3) - 12}$

Step 2

Multiply $4$ by $3$ .

$f (3) = \frac{7 (3) - 4}{12 - 12}$

Step 3

Subtract $12$ from $12$ .

$f (3) = \frac{7 (3) - 4}{0}$

Step 4

The expression contains a division by $0$ . The expression is undefined.

Undefined