Question 1 [s variables Given the function of two f(x, y) = -4x² - 6xy-7y²-1. a) Use Lagrange Multipliers to find the extreme value(s) of the function f subject to the constraint -4x+y+6=0. b) [Verify that f(x, y) = 19 - 17 (4x + 3y)²2 - ( 12 y ²+1). c) [1] Show that ƒ has maximum and no minimum with the constraint -4x+y+6 = 0.

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