What is the complex modulus (absolute value) of the complex number z = 3 - 4i?
Answer and explanation
Correct answer: D. 5
For a complex number z = a + bi, the modulus is |z| = sqrt(a^2 + b^2). Substituting a = 3 and b = -4: |z| = sqrt(3^2 + (-4)^2) = sqrt(9 + 16) = sqrt(25) = 5.
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