Complex Numbers
Modulus and Argument
Grade Class 11

Question:

<p>If \(|z-2+3i|=9\), then the greatest value of \(|z|\) is:</p>
\(\sqrt{13}+9\)
\(9-\sqrt{13}\)
\(9+\sqrt{13}\)
\(13+9\)

Step-by-Step Solution

Key Concept: Centre at 2-3i, radius 9. |2-3i| = \sqrt{13.} Max |z| = \sqrt{13} + 9.
<p>Circle centre $c=2-3i$, $|c|=\sqrt{4+9}=\sqrt{13}$. Max $|z| = |c|+r = \sqrt{13}+9$. ✓ Answer A=C depends on option labelling.</p>
Correct Answer: C

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