Answer
$-10i$
Work Step by Step
The given expression equivalent to:
$6i^3-4i^{5}=6i^3-4i^{3}\cdot i^2$
Use $i^3=-i$ and $i^2=-1$.
$=6(-i)-4(-i)\cdot (-1)$
$=-6i+4i\cdot (-1)$
$=-6i-4i$
$=-10i$
Hence, the solution in the standard form is $-10i$.
