Final answer:
The absolute value of the complex number 3 - 4i is calculated using the formula √(a² + b²) and equals 5.
Step-by-step explanation:
The absolute value of a complex number is found using the formula √(a² + b²), where 'a' and 'b' are the real and imaginary parts of the complex number, respectively. For the complex number 3 - 4i, we substitute a = 3 and b = -4 into the formula to get:
| 3 - 4i | = √(3² + (-4)²) = √(9 + 16) = √25 = 5.
The absolute value of the complex number 3 - 4i is 5.