Let x = 1, y = 3. Find the value of the given capital letter.
N = x**2 + 2 xy + y**2 + 3
yu can do it all manually, or you can note that
(x^2 + 2xy + y^2) = (x+y)^2, so
N = (1+3)^2 + 3 = 16+3 = 19
N = x**2 + 2 xy + y**2 + 3
(x^2 + 2xy + y^2) = (x+y)^2, so
N = (1+3)^2 + 3 = 16+3 = 19