LaTeX: f\left(x, y\right)=-4x^2+4xy-2y^2+6x+8yf ( x , y ) = − 4 x 2 + 4 x y − 2 y 2 + 6 x + 8 y Suppose that there is a constraint such that LaTeX: x+y\le7x + y ≤ 7 What is the value of the lagrange multiplier?

Jack has a rectangular piece of land, the area of which is represented by a1 = 9.5l. his brother has a different rectangular piece of land, the area of which is represented by a2 = l(14 − l). let a represent the area in square meters and l represent the length in meters of the pieces of land. the two equations plotted on a graph meet at a point as shown in the image