Find Where Undefined/Discontinuous (12z^2+20z)/(z^2+2z)

$\frac{12 z^{2} + 20 z}{z^{2} + 2 z}$

Step 1

Set the denominator in $\frac{12 z^{2} + 20 z}{z^{2} + 2 z}$ equal to $0$ to find where the expression is undefined.

$z^{2} + 2 z = 0$

Step 2

Solve for $z$ .

Factor $z$ out of $z^{2} + 2 z$ .

Factor $z$ out of $z^{2}$ .

$z \cdot z + 2 z = 0$

Factor $z$ out of $2 z$ .

$z \cdot z + z \cdot 2 = 0$

Factor $z$ out of $z \cdot z + z \cdot 2$ .

$z (z + 2) = 0$

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

$z = 0$

$z + 2 = 0$

Set $z$ equal to $0$ .

$z = 0$

Set $z + 2$ equal to $0$ and solve for $z$ .

Set $z + 2$ equal to $0$ .

$z + 2 = 0$

Subtract $2$ from both sides of the equation.

$z = - 2$

The final solution is all the values that make $z (z + 2) = 0$ true.

$z = 0, - 2$

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 $0$ .

$z = - 2, z = 0$

Step 4

Find Where Undefined/Discontinuous (12z^2+20z)/(z^2+2z)

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