Answer: (1, 3).
- A (1, 3)
- B [1, 3]
- C (-inf, 1)
- D (3, inf)
Correct answer: A. (1, 3)
Explanation: Factor the quadratic: x²-4x+3 = (x-1)(x-3). Find zeros: x=1 and x=3. Since leading coefficient is positive, parabola opens upward. The product (x-1)(x-3) is negative between the roots: 1 < x < 3. Answer: x ∈ (1, 3)
Concept context
Ordered pairs, Cartesian products, types of relations and functions, domain and range. Foundation for calculus and Class 12 algebra.