i have to solve B

Question 4 (25 points) There is no connection between the segments of this question 3. Use Lagrange multipliers method to nd the extreme points of the function f(x, y) = y under the constraint: x2 +4.}: + y\" +2 y = 4, and categorize them as max or min. b. Given the function: f(.x, y} which satises: f(2, l) = 8 f(1.98, l .03) = 7.83 f ' '12. l) = 3 . Estimate the value of f'ICZ. 1)