Question

Find the values of X where the expression below is not defined

Answer 1

`4,-4`

Step-by-step explanation

Given;

`(x^2+9x+18)/(x^2-16)`

For the expression to be not defined, the denominator must be equal to zero.;

Hence,

`\:x^2-16\:=0`

Add 16 to both sides;

`\begin{gathered} x^2-16+16=0+16 \\ x^2=16 \\ \end{gathered}`

Find square root of both sides;

`\begin{gathered} x=√(16) \\ x=\pm4 \end{gathered}`