I somehow got 0 for this first question, don't know why

Consider the function f(:o, y) = my2 a: + 1. a) [5 points] Find the equation of tangent plane at the point (0, 1). b) [10 points] Find the global (absolute) maximum and minimum values of the function in the region B = {[m,y) | 3:2 + y2 S 1, y 2 D}. In other words the region 1) is