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Simplifying
(4i)(-10i) = 0
Remove parenthesis around (4i)
4i(-10i) = 0
Remove parenthesis around (-10i)
4i * -10i = 0
Reorder the terms for easier multiplication:
4 * -10i * i = 0
Multiply 4 * -10
-40i * i = 0
Multiply i * i
-40i2 = 0
Solving
-40i2 = 0
Solving for variable 'i'.
Move all terms containing i to the left, all other terms to the right.
Divide each side by '-40'.
i2 = 0.0
Simplifying
i2 = 0.0
Take the square root of each side:
i = {0.0}
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