Respuesta :

konrad509
[tex]-7i(6i-3)=\\ -42\cdot(-1)+21i=\\ 42+21i[/tex]
AL2006
-7i (6i - 3)

Perform the distributed multiplication to eliminate the parentheses:

-7i (6i) - 7i (-3) = -42i² + 21i

IF i = √-1 , then the expression is equal to (42 + 21i) or 21(2 + i) .