Question

${x}^{2} - 9 \sqrt{2x - 4}$
for which value of x is this expression undefined?​

Answer 1

Answer:

When $x<2$

Step-by-step explanation:

When $x$ is smaller than $2$, the resulting value under the square root will become negative. Since it is impossible to take the root of a negative number, the expression is thus undefined, however, it can be represented with the imaginary number $i$ where $i$ = $\sqrt{-1}$.

Hope this helps :)