4i(-5i)=

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Solution for 4i(-5i)= equation: 


Simplifying
4i(-5i) = 0

Remove parenthesis around (-5i)
4i * -5i = 0

Reorder the terms for easier multiplication:
4 * -5i * i = 0

Multiply 4 * -5
-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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