Find Where Undefined/Discontinuous ((x^2-25)/(5x-5))÷((x^2+10x+25)/(x^2+4x-5))

$\frac{x^{2} - 25}{5 x - 5} \div \frac{x^{2} + 10 x + 25}{x^{2} + 4 x - 5}$

Step 1

Set the denominator in $\frac{x^{2} - 25}{5 x - 5}$ equal to $0$ to find where the expression is undefined.

$5 x - 5 = 0$

Step 2

Solve for $x$ .

Add $5$ to both sides of the equation.

$5 x = 5$

Divide each term in $5 x = 5$ by $5$ and simplify.

Divide each term in $5 x = 5$ by $5$ .

$\frac{5 x}{5} = \frac{5}{5}$

Simplify the left side.

Cancel the common factor of $5$ .

Cancel the common factor.

$\frac{5 x}{5} = \frac{5}{5}$

Divide $x$ by $1$ .

$x = \frac{5}{5}$

Simplify the right side.

Divide $5$ by $5$ .

$x = 1$

Step 3

Set the denominator in $\frac{x^{2} + 10 x + 25}{x^{2} + 4 x - 5}$ equal to $0$ to find where the expression is undefined.

$x^{2} + 4 x - 5 = 0$

Step 4

Solve for $x$ .

Factor $x^{2} + 4 x - 5$ 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 $- 5$ and whose sum is $4$ .

$- 1, 5$

Write the factored form using these integers.

$(x - 1) (x + 5) = 0$

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

$x - 1 = 0$

$x + 5 = 0$

Set $x - 1$ equal to $0$ and solve for $x$ .

Set $x - 1$ equal to $0$ .

$x - 1 = 0$

Add $1$ to both sides of the equation.

$x = 1$

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 $(x - 1) (x + 5) = 0$ true.

$x = 1, - 5$

Step 5

Set the denominator in $\frac{\frac{x^{2} - 25}{5 x - 5}}{\frac{x^{2} + 10 x + 25}{x^{2} + 4 x - 5}}$ equal to $0$ to find where the expression is undefined.

$\frac{x^{2} + 10 x + 25}{x^{2} + 4 x - 5} = 0$

Step 6

Solve for $x$ .

Set the numerator equal to zero.

$x^{2} + 10 x + 25 = 0$

Solve the equation for $x$ .

Factor using the perfect square rule.

Rewrite $25$ as $5^{2}$ .

$x^{2} + 10 x + 5^{2} = 0$

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

$10 x = 2 \cdot x \cdot 5$

Rewrite the polynomial.

$x^{2} + 2 \cdot x \cdot 5 + 5^{2} = 0$

Factor using the perfect square trinomial rule $a^{2} + 2 a b + b^{2} = {(a + b)}^{2}$ , where $a = x$ and $b = 5$ .

${(x + 5)}^{2} = 0$

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

$x + 5 = 0$

Subtract $5$ from both sides of the equation.

$x = - 5$

Exclude the solutions that do not make $\frac{x^{2} + 10 x + 25}{x^{2} + 4 x - 5} = 0$ true.

$No solution$

Step 7

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 $0$ .

$x = - 5, x = 1$

Step 8

Find Where Undefined/Discontinuous ((x^2-25)/(5x-5))÷((x^2+10x+25)/(x^2+4x-5))

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