Find the Excluded Values (3x^2-18x)/(x^2-2x-24)

$\frac{3 x^{2} - 18 x}{x^{2} - 2 x - 24}$

Step 1

Set the denominator in $\frac{3 x^{2} - 18 x}{x^{2} - 2 x - 24}$ equal to $0$ to find where the expression is undefined.

$x^{2} - 2 x - 24 = 0$

Step 2

Solve for $x$ .

Factor $x^{2} - 2 x - 24$ using the AC method.

Consider the form $x^{2} + b x + c$ . Find a pair of integers whose product is $c$ and whose sum is $b$ . In this case, whose product is $- 24$ and whose sum is $- 2$ .

$- 6, 4$

Write the factored form using these integers.

$(x - 6) (x + 4) = 0$

If any individual factor on the left side of the equation is equal to $0$ , the entire expression will be equal to $0$ .

$x - 6 = 0$

$x + 4 = 0$

Set $x - 6$ equal to $0$ and solve for $x$ .

Set $x - 6$ equal to $0$ .

$x - 6 = 0$

Add $6$ to both sides of the equation.

$x = 6$

Set $x + 4$ equal to $0$ and solve for $x$ .

Set $x + 4$ equal to $0$ .

$x + 4 = 0$

Subtract $4$ from both sides of the equation.

$x = - 4$

The final solution is all the values that make $(x - 6) (x + 4) = 0$ true.

$x = 6, - 4$

Step 3

The equation is undefined where the denominator equals $0$ , the argument of a square root is less than $0$ , or the argument of a logarithm is less than or equal to $0$ .

$x = - 4, x = 6$

Step 4

Find the Excluded Values (3x^2-18x)/(x^2-2x-24)

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