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Simplifying
(5i)(-2i) = 0
Remove parenthesis around (5i)
5i(-2i) = 0
Remove parenthesis around (-2i)
5i * -2i = 0
Reorder the terms for easier multiplication:
5 * -2i * i = 0
Multiply 5 * -2
-10i * i = 0
Multiply i * i
-10i2 = 0
Solving
-10i2 = 0
Solving for variable 'i'.
Move all terms containing i to the left, all other terms to the right.
Divide each side by '-10'.
i2 = 0.0
Simplifying
i2 = 0.0
Take the square root of each side:
i = {0.0}
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