Question

multiply.
\sqrt{4} \cdot \sqrt{-1}
\sqrt{4} \cdot \sqrt{-1} = \square
(simplify your answer. type an exact answer, using radicals and i as needed.)

Explanation:

Step1: Simplify positive square root

$\sqrt{4} = 2$

Step2: Represent imaginary unit

$\sqrt{-1} = i$

Step3: Multiply the two results

$2 \cdot i = 2i$

Answer:

$2i$