Second last digit is 7

Replace B in this question with the second to last digit of your student number. Consider the function 2 - (3 + 1)22 + 92 (a) Sketch the level curves of z for the values 2 - 1,0, -1 (you may use any technology to help in this). (b) Sketch the cross section given by x = 0. (c) Sketch the cross section given by y = 0. (d) Accurately describe this surface. (e.g. "this is a two-sheeted hyperboloid" which it isn't by the way!)