C. 17 / 17
ExplanationStep 1: This is a conjugate product. Step 2: (4+i)(4-i)=4²-i²=16-(-1)=17. Step 3: Always remember i² = -1.
Step 1: यह conjugate product है। Step 2: (4+i)(4-i)=4²-i²=16-(-1)=17। Step 3: i² = -1 हमेशा याद रखें।
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