Answer
(7i)(-9i) = 63
Work Step by Step
Directions: Perform the indicated operation. Write the result in the form a+bi.
(7i)(-9i)
-63$i^{2}$
Multiply
-63⋅-1
i=$\sqrt -1$ which means $i^{2}$=$\sqrt -1$ ⋅$\sqrt -1$ = -1
63
Multiply -63 and -1 to get final answer
