Simplify -4/(7i)

$\frac{- 4}{7 i}$

Multiply the numerator and denominator of $\frac{- 4}{7 i}$ by the conjugate of $7 i$ to make the denominator real.

$\frac{- 4}{7 i} \cdot \frac{i}{i}$

Multiply.

Combine.

$\frac{- 4 i}{7 i i}$

Simplify the denominator.

Add parentheses.

$\frac{- 4 i}{7 (i i)}$

Raise $i$ to the power of $1$ .

$\frac{- 4 i}{7 (i^{1} i)}$

Raise $i$ to the power of $1$ .

$\frac{- 4 i}{7 (i^{1} i^{1})}$

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$\frac{- 4 i}{7 i^{1 + 1}}$

Add $1$ and $1$ .

$\frac{- 4 i}{7 i^{2}}$

Rewrite $i^{2}$ as $- 1$ .

$\frac{- 4 i}{7 \cdot - 1}$

Multiply $7$ by $- 1$ .

$\frac{- 4 i}{- 7}$

Dividing two negative values results in a positive value.

$\frac{4 i}{7}$