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Simplifying 3i(7 + -3i) = 9 + 21i (7 * 3i + -3i * 3i) = 9 + 21i (21i + -9i2) = 9 + 21i Add '-21i' to each side of the equation. 21i + -21i + -9i2 = 9 + 21i + -21i Combine like terms: 21i + -21i = 0 0 + -9i2 = 9 + 21i + -21i -9i2 = 9 + 21i + -21i Combine like terms: 21i + -21i = 0 -9i2 = 9 + 0 -9i2 = 9 Solving -9i2 = 9 Solving for variable 'i'. Move all terms containing i to the left, all other terms to the right. Divide each side by '-9'. 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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