88 ! consider the function f(x)=x(x-4). if the point (2+c, y) is on the graph of f(x), the following point will also be on the graph of f(x): select a value (c-2,y) (2-c, y)

answer: evaluate the objective function at each vertex to determine which - and -values, if any, maximize or minimize the function. example: find the minimum value and maximum value of the objective function f ( x , y ) = 4 x + 5 y , subject to the following constraints