Answer
$\dfrac{4}{i}=-4i$
Work Step by Step
$\dfrac{4}{i}$
Multiply the numerator and the denominator by the complex conjugate of the denominator:
$\dfrac{4}{i}=\dfrac{4}{i}\cdot\dfrac{-i}{-i}=\dfrac{-4i}{-i^{2}}=...$
Substitute $i^{2}$ by $-1$ and simplify:
$...=\dfrac{-4i}{-(-1)}=\dfrac{-4i}{1}=-4i$
