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The value of (z + 3) (z̅ + 3) is equivalent toA. |z + 3|3B. |z – 3|C. z2 + 3D. None of these |
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Answer» A. |z + 3|3 Given (z + 3) (z̅ + 3) = (x + iy + 3) (x –iy + 3) = (x + 3)2 – (iy)2 = (x + 3)2 + y2 = |x + 3 + iy|2 = |z + 3|2 |
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