Answer: p² = 4q.
- A p² = 4q
- B p² = 2q
- C p = q
- D q = 4p
Correct answer: A. p² = 4q
Explanation: Equal roots require the discriminant to be zero: p² − 4q = 0, so p² = 4q.
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 →