2 (6*x + 5*y)
(6*x + 5*y)^2 при y = -3/2
(6*x + 5*y)^2
(6*x + 5*(-3/2))^2
(6*x + 5*(-3)/2)^2
(-15/2 + 6*x)^2
(6.0*x + 5.0*y)^2
2 2 25*y + 36*x + 60*x*y