Perform the indicated operation and write and standard form. -7i(6i-3)

-7i (6i - 3)Perform the distributed multiplication to eliminate the parentheses:-7i (6i) - 7i (-3) = -42i² + 21iIF i = √-1 , then the expression is equal to (42 + 21i) or 21(2 + i) .

[tex]-7i(6i-3)=\\
-42\cdot(-1)+21i=\\
42+21i[/tex]