Can someone help please

Using Lagrange multipliers calculate the local maximum of f(x, y) = 4x -y - 2 subject to the constraint z - 2 y = 4. Enter the exact value of f at the local maximum in the box below. Warning: If your answer involves a square root, use either sqrt or power 1/2. Note: 20- Z TTT - 4- 3-2-10 1 2 3 4 -1-2-3-4 3 2 X In the above plot, the equation of the plane is z = 4 x -y -2 and the equation of the red surface is x2 - 2y2 = 4