Which operations can be applied to a matrix in the process of gauss-jordan elimination? replacing a row with twice that row replacing a row with the sum of that row and another row replacing a row with three times another row swapping rows replacing a row with the absolute values of that row

Is there a direction u in which the rate of change of f(x,y)equals=x squared minus 3 xy plus 4 y squaredx2−3xy+4y2 at p(1,2) equals 14? give reasons for your answer. choose the correct answer below. a. no. the given rate of change is smaller than the minimum rate of change. b. no. the given rate of change is larger than the maximum rate of change. c. yes. the given rate of change is larger than the minimum rate of change and smaller than the maximum rate of change.