(7i)(-3i)=

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Solution for (7i)(-3i)= equation: 


Simplifying
(7i)(-3i) = 0

Remove parenthesis around (7i)
7i(-3i) = 0

Remove parenthesis around (-3i)
7i * -3i = 0

Reorder the terms for easier multiplication:
7 * -3i * i = 0

Multiply 7 * -3
-21i * i = 0

Multiply i * i
-21i2 = 0

Solving
-21i2 = 0

Solving for variable 'i'.

Move all terms containing i to the left, all other terms to the right.

Divide each side by '-21'.
i2 = 0

Simplifying
i2 = 0

Take the square root of each side:
i = {0}

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