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Simplifying (7 + i)(7 + -1i) = 0 Multiply (7 + i) * (7 + -1i) (7(7 + -1i) + i(7 + -1i)) = 0 ((7 * 7 + -1i * 7) + i(7 + -1i)) = 0 ((49 + -7i) + i(7 + -1i)) = 0 (49 + -7i + (7 * i + -1i * i)) = 0 (49 + -7i + (7i + -1i2)) = 0 Combine like terms: -7i + 7i = 0 (49 + 0 + -1i2) = 0 (49 + -1i2) = 0 Solving 49 + -1i2 = 0 Solving for variable 'i'. Move all terms containing i to the left, all other terms to the right. Add '-49' to each side of the equation. 49 + -49 + -1i2 = 0 + -49 Combine like terms: 49 + -49 = 0 0 + -1i2 = 0 + -49 -1i2 = 0 + -49 Combine like terms: 0 + -49 = -49 -1i2 = -49 Divide each side by '-1'. i2 = 49 Simplifying i2 = 49 Take the square root of each side: i = {-7, 7}
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