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Simplifying
(-2i)(5i) = 0
Remove parenthesis around (-2i)
-2i(5i) = 0
Remove parenthesis around (5i)
-2i * 5i = 0
Reorder the terms for easier multiplication:
-2 * 5i * i = 0
Multiply -2 * 5
-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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