A company manufactures two products, A and B. If x is the number of thousands of units

Question:

A company manufactures two products, A and B. If x is the number of thousands of units of A and y is the number of thousands of units of B, then the cost and revenue in thousands of dollars are
C(x, y) = 2x2 - 2xy + y2 - 7x - 10y + 11
R(x, y) = 5x + 8y
Find the number of each type of product that should be manufactured to maximize profit. What is the maximum profit?