Answer: 0.
- A 0
- B 16
- C 32
- D -16
Correct answer: A. 0
Explanation: D = b² - 4ac = 16 - 4(1)(4) = 16 - 16 = 0. Equal roots.
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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