Answer: ±8.
- A ±4
- B ±8
- C ±6
- D ±5
Correct answer: B. ±8
Explanation: Let roots be a and 3a. Product: 3a² = 12, a = ±2. Sum = 4a = ±8 = -p. p = ±8.
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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