Answer: x = -1.
- A x = 1
- B x = -1
- C x = 0
- D x = 2
Correct answer: B. x = -1
Explanation: x² + x = 0, x(x+1) = 0, so x = 0 or x = -1. Since x is not zero, x = -1.
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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