Answer: -2.
- A 7
- B -2i
- C -2
- D 2
Correct answer: C. -2
Explanation: In z = a+ib, Im(z) = b (just the coefficient). Here Im(z) = -2.
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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