Answer: Two equal real roots.
- A Two distinct real roots
- B Two equal real roots
- C No real roots
- D One positive one negative
Correct answer: B. Two equal real roots
Explanation: D = 144 - 4(4)(9) = 144 - 144 = 0. Equal roots: x = 12/8 = 3/2.
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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