Problem

Multiply.
\[
8 i(9-4 i)
\]

Answer

Expert–verified

Hide Steps

Answer

\(\boxed{32 + 72i}\)

Steps

Step 1 ：\(8i*(9 - 4i) = 8i*9 - 8i*4i\)

Step 2 ：\(= 72i - 32i^2\)

Step 3 ：\(= 72i - 32*(-1)\)

Step 4 ：\(\boxed{32 + 72i}\)

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