Algebra Examples

$f (x) = \frac{x^{2} - 4 x + 4}{x^{2} - 4}$

Step 1

Set $\frac{x^{2} - 4 x + 4}{x^{2} - 4}$ equal to $0$ .

$\frac{x^{2} - 4 x + 4}{x^{2} - 4} = 0$

Step 2

Solve for $x$ .

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Step 2.1

Set the numerator equal to zero.

$x^{2} - 4 x + 4 = 0$

Step 2.2

Solve the equation for $x$ .

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Step 2.2.1

Factor using the perfect square rule.

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Step 2.2.1.1

Rewrite $4$ as $2^{2}$ .

$x^{2} - 4 x + 2^{2} = 0$

Step 2.2.1.2

Check that the middle term is two times the product of the numbers being squared in the first term and third term.

$4 x = 2 \cdot x \cdot 2$

Step 2.2.1.3

Rewrite the polynomial.

$x^{2} - 2 \cdot x \cdot 2 + 2^{2} = 0$

Step 2.2.1.4

Factor using the perfect square trinomial rule $a^{2} - 2 a b + b^{2} = {(a - b)}^{2}$ , where $a = x$ and $b = 2$ .

${(x - 2)}^{2} = 0$

Step 2.2.2

Set the $x - 2$ equal to $0$ .

$x - 2 = 0$

Step 2.2.3

Add $2$ to both sides of the equation.

$x = 2$

Step 2.3

Exclude the solutions that do not make $\frac{x^{2} - 4 x + 4}{x^{2} - 4} = 0$ true.

$No solution$