# How do you multiply (i)(2i)(-7i)?

Aug 22, 2016

$\left(i\right) \left(2 i\right) \left(- 7 i\right) = 14 i$

#### Explanation:

While dealing with operations like multiplication and division of complex numbers, one needs to remember that ${i}^{2} = - 1$.

Hence, $\left(i\right) \left(2 i\right) \left(- 7 i\right)$

= 2i^2×(-7i)

= -2×(-7i)

= $14 i$