Find the Excluded Values (x^2+x-6)/(x^2+8x+15)

$\frac{x^{2} + x - 6}{x^{2} + 8 x + 15}$

Step 1

Set the denominator in $\frac{x^{2} + x - 6}{x^{2} + 8 x + 15}$ equal to $0$ to find where the expression is undefined.

$x^{2} + 8 x + 15 = 0$

Step 2

Solve for $x$ .

Factor $x^{2} + 8 x + 15$ 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 $15$ and whose sum is $8$ .

$3, 5$

Write the factored form using these integers.

$(x + 3) (x + 5) = 0$

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

$x + 3 = 0$

$x + 5 = 0$

Set $x + 3$ equal to $0$ and solve for $x$ .

Set $x + 3$ equal to $0$ .

$x + 3 = 0$

Subtract $3$ from both sides of the equation.

$x = - 3$

Set $x + 5$ equal to $0$ and solve for $x$ .

Set $x + 5$ equal to $0$ .

$x + 5 = 0$

Subtract $5$ from both sides of the equation.

$x = - 5$

The final solution is all the values that make $(x + 3) (x + 5) = 0$ true.

$x = - 3, - 5$

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 $0$ .

$x = - 5, x = - 3$

Step 4

Find the Excluded Values (x^2+x-6)/(x^2+8x+15)

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