Question 11
Consider the statements:
$$
\begin{aligned} \mathrm{I:}\quad &(\sqrt{-4})(\sqrt{-16})\\ &=\sqrt{(-4)(-16)}, \end{aligned}
$$
$$
\mathrm{II:}\quad \sqrt{(-4)(-16)}=\sqrt{64},
$$
and
$$
\mathrm{III:}\quad \sqrt{64}=8.
$$
Of these the following are *incorrect*:
$$
\begin{aligned} \mathrm{I:}\quad &(\sqrt{-4})(\sqrt{-16})\\ &=\sqrt{(-4)(-16)}, \end{aligned}
$$
$$
\mathrm{II:}\quad \sqrt{(-4)(-16)}=\sqrt{64},
$$
and
$$
\mathrm{III:}\quad \sqrt{64}=8.
$$
Of these the following are *incorrect*: