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Simplifying 3i(-7i) = 0 Remove parenthesis around (-7i) 3i * -7i = 0 Reorder the terms for easier multiplication: 3 * -7i * i = 0 Multiply 3 * -7 -21i * i = 0 Multiply i * i -21i2 = 0 Solving -21i2 = 0 Solving for variable 'i'. Move all terms containing i to the left, all other terms to the right. Divide each side by '-21'. i2 = 0 Simplifying i2 = 0 Take the square root of each side: i = {0}
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