Algebra Examples

$f (x) = \frac{2}{x - 7}$ , $g (x) = \frac{2}{x} + 7$

Step 1

Set up the composite result function.

$f (g (x))$

Step 2

Evaluate $f (\frac{2}{x} + 7)$ by substituting in the value of $g$ into $f$ .

$f (\frac{2}{x} + 7) = \frac{2}{(\frac{2}{x} + 7) - 7}$

Step 3

Simplify the denominator.

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Step 3.1

Subtract $7$ from $7$ .

$f (\frac{2}{x} + 7) = \frac{2}{\frac{2}{x} + 0}$

Step 3.2

Add $\frac{2}{x}$ and $0$ .

$f (\frac{2}{x} + 7) = \frac{2}{\frac{2}{x}}$

Step 4

Multiply the numerator by the reciprocal of the denominator.

$f (\frac{2}{x} + 7) = 2 (\frac{x}{2})$

Step 5

Cancel the common factor of $2$ .

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Step 5.1

Cancel the common factor.

$f (\frac{2}{x} + 7) = 2 (\frac{x}{2})$

Step 5.2

Rewrite the expression.

$f (\frac{2}{x} + 7) = x$