Question

current learning objective: multiplying complex numbers
question 20
score: 0 of 1 point
simplify the following expression
(9i)·(13i)= enter your answer
if the answer is complex use i to denote i.
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Explanation:

Step1: Multiply the coefficients

Multiply 9 and 13: $9\times13 = 117$.

Step2: Multiply the imaginary - parts

Multiply $i$ and $i$: $i\times i=i^{2}$. Since $i^{2}=-1$.

Step3: Combine the results

The product $(9i)\times(13i)=117\times i^{2}$. Substitute $i^{2}=-1$ into the expression, we get $117\times(-1)=- 117$.

Answer:

$-117$