Question

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

Answer 1

ANSWER

$4,-4$

EXPLANATION

Given;

$\frac{x^2+9x+18}{x^2-16}$

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;

$\begin{gathered} x=\sqrt{16} \\ x=\pm4 \end{gathered}$