B. 15 / 15
ExplanationStep 1: Use modulus formula |a+ib| = √(a²+b²). Step 2: √(9²+(-12)²)=√225=15. Step 3: In modulus sign becomes positive after squaring.
Step 1: Modulus formula |a+ib| = √(a²+b²) लगाएं। Step 2: √(9²+(-12)²)=√225=15। Step 3: Modulus में sign square होने पर positive हो जाता है।
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