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Simplifying
(5i)(-4i) = 0
Remove parenthesis around (5i)
5i(-4i) = 0
Remove parenthesis around (-4i)
5i * -4i = 0
Reorder the terms for easier multiplication:
5 * -4i * i = 0
Multiply 5 * -4
-20i * i = 0
Multiply i * i
-20i2 = 0
Solving
-20i2 = 0
Solving for variable 'i'.
Move all terms containing i to the left, all other terms to the right.
Divide each side by '-20'.
i2 = 0.0
Simplifying
i2 = 0.0
Take the square root of each side:
i = {0.0}
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