Find Where Undefined/Discontinuous (y^2+4y-21)/(y^2-5y+6)

$\frac{y^{2} + 4 y - 21}{y^{2} - 5 y + 6}$

Step 1

Set the denominator in $\frac{y^{2} + 4 y - 21}{y^{2} - 5 y + 6}$ equal to $0$ to find where the expression is undefined.

$y^{2} - 5 y + 6 = 0$

Step 2

Solve for $y$ .

Factor $y^{2} - 5 y + 6$ 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 $6$ and whose sum is $- 5$ .

$- 3, - 2$

Write the factored form using these integers.

$(y - 3) (y - 2) = 0$

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

$y - 3 = 0$

$y - 2 = 0$

Set $y - 3$ equal to $0$ and solve for $y$ .

Set $y - 3$ equal to $0$ .

$y - 3 = 0$

Add $3$ to both sides of the equation.

$y = 3$

Set $y - 2$ equal to $0$ and solve for $y$ .

Set $y - 2$ equal to $0$ .

$y - 2 = 0$

Add $2$ to both sides of the equation.

$y = 2$

The final solution is all the values that make $(y - 3) (y - 2) = 0$ true.

$y = 3, 2$

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 $0$ .

$y = 2, y = 3$

Step 4

Find Where Undefined/Discontinuous (y^2+4y-21)/(y^2-5y+6)

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