Question 1 X= y= ▼ • Use partial derivatives to locate critical points for a function of two variables. Find the values of x, y and z that correspond to the critical point of the function: = f(x, y) = 3x² + 8x - 7y + 5y² +7xy 2= Enter your answer as a decimal number, or a calculation (like 22/7). 2= < Question Help: Video Submit Question > (Round to 4 decimal places) (Round to 4 decimal places) (Round to 4 decimal places)

i have two answers but am not sure which one is the correct answer and i need help to solve it i add two pic add help me solve it  Problem: A piece of wire, 400 cm long, is to be bent into an isosceles triangle. What should the dimensions of the triangle be in order to maximize its area? Use the First and Second Derivative Tests (derivatives, calculations, and tables for FDT and SDT) to check that your answer(s) is (are) indeed, for the maximum. Determine the maximum value for the area of this triangle. Round you answer(s) to the nearest tenth.

Find & values of all points on the graph of + 3x² -11x +5 where the slope of tangent line is g=x² negative Total:/

Find the critical values of f then use the second derivative to determine if f has a relative maximum or relative minimum at each critical value.