Answer: ax² + bx + c = 0.
- A ax + b = 0
- B ax² + bx + c = 0
- C ax³ + bx + c = 0
- D a/x + b = 0
Correct answer: B. ax² + bx + c = 0
Explanation: The standard form is ax² + bx + c = 0, where a, b, c are constants and a ≠ 0.
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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