Cho biểu thức: N=(x-a)(x-b)+(x-b)(x-c)+(x-c)(x-a)+ x^2. tính n theo a b c biết x=1/2a+1/2b+1/2c

Ms.ortiz sells tomatoes wholesale. the function p(x)=-80x^2+320x-10, graphed below, indicates how much profit she makes on a load of tomatoes if she makes on a load of tomatoes if she sells them for 4-x dollars per kilogram. what should ms.ortiz charge per kilogram of tomatoes to make on a load of tomatoes?