Question

simplify. -4i(-1) write your answer in the form a + bi.

Explanation:

Step1: Multiply the constants

Multiply -4 and -1.
$-4\times(-1)=4$

Step2: Combine with $i$

The result is $4i$, which in the form $a + bi$ is $0+4i$.

Answer:

$0 + 4i$