C. 10 / 10
ExplanationStep 1: This is a conjugate product. Step 2: (3+i)(3-i)=3²-i²=9-(-1)=10. Step 3: Always remember i² = -1.
Step 1: यह conjugate product है। Step 2: (3+i)(3-i)=3²-i²=9-(-1)=10। Step 3: i² = -1 को हमेशा याद रखें।
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