Single Answer MCQ
Q-00051736
If z1 = 2 + 3i and z2 = 2 - 3i, what is z1 * z2?
1
4 + 6i
2
0
3
13
4
4 - 9
Answer and Solution
Answer
C. 13
Solution:
The product is z1 * z2 = (2 + 3i)(2 - 3i) = 4 + 9 = 13, using the formula (a+b)(a-b) = a^2 - b^2.
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