Answer:
12
Step-by-step explanation:
To evaluate the given expression for the given value of k, put that value into the expression in place of k, then do the arithmetic.
[tex]\sqrt{-72k}\qquad\text{for $k=-2$}\\\\\sqrt{(-72)(-2)}=\sqrt{144}=12\qquad\text{positive square root}[/tex]
The value is 12.
