Answer: 2/3 and -1/2.
- A 2/3 and -1/2
- B 1/2 and -2/3
- C 1/3 and -2
- D 2 and -1/3
Correct answer: A. 2/3 and -1/2
Explanation: 6x² - x - 2 = (2x+1)(3x-2) = 0. x = -1/2 or x = 2/3.
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
Read the full Complex Numbers and Quadratic Equations notes →