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Simplifying 9i * 9i = -81 Reorder the terms for easier multiplication: 9 * 9i * i = -81 Multiply 9 * 9 81i * i = -81 Multiply i * i 81i2 = -81 Solving 81i2 = -81 Solving for variable 'i'. Move all terms containing i to the left, all other terms to the right. Divide each side by '81'. i2 = -1 Simplifying i2 = -1 Reorder the terms: 1 + i2 = -1 + 1 Combine like terms: -1 + 1 = 0 1 + i2 = 0 The solution to this equation could not be determined.
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