Answer: (3,4).
- A (4,3)
- B (3,4)
- C (-3,4)
- D (3,-4)
Correct answer: B. (3,4)
Explanation: z = a+ib is plotted as (a, b) in the Argand plane. So 3+4i is at (3, 4).
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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