Question Detail
Question
Obtain the modulus of the complex number (3 - 5i)(2 + i).
Correct Answer
Option D is the correct answer.
Detailed Explanation
First compute product: (3-5i)(2+i) = 6+3i-10i-5i² = 6-7i+5 = 11-7i. Modulus = √(11²+(-7)²) = √(121+49) = √170.
Hint
|z1·z2| = |z1|·|z2|. Alternatively, compute product first then modulus.