वक्र f(x) = x4 और g(x) = 3x2 + 4 एक-दूसरे को कितने बिंदुओं पर काटते हैं?

The weight of a person can be expressed as a function of their age. Suppose this function is identical for two brothers; it monotonically increases until the age of 50 years and then monotonically decreases. Let a1 and a2 (in years) denote the current ages of the two brothers such that a1 < a2. Which one of the following statements is correct regarding their ages on a day when they both have exactly the same weight?

The function f is defined by f(x) = x2 + 4. What are the coordinates of the vertex of the parabola represented by y = f(x)?