can someone explain the how to get that answer in question 5, i dont get why it is a parabola...
after substituting the values (2, 9) into the f(x,y) you get e^0, hence 1.
what do u do then?
im guessing he did x^2 - y + 5 = 0, which is the parabola drawn, but why did he make f(x,y) = 0...