Answer: 6 + 2i.
- A 2 + 4i
- B 6 - 2i
- C 6 + 2i
- D 6 + 4i
Correct answer: C. 6 + 2i
Explanation: Add real parts: 2+4=6. Add imaginary parts: 3+(-1)=2. Result: 6 + 2i.
A complex number z = a+ib is plotted as a point (or vector from the origin) on the Argand plane, with the real part along the horizontal axis and the imaginary part along the vertical; its modulus |z| is the vector's length, and its argument θ is the angle from the positive real axis.
Concept context
Complex numbers in a+ib form, modulus, argument, polar form, cube roots of unity, and quadratic equations with complex roots
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