Find all points at which the direction of fastest change of the function f(x, y) = x2 y2 − 6x − 8y is i j. (enter your answer as an equation. ).

The vertex of the quadratic function is (1.5, -.75)

Look, when you want to do something like put it like x^2. x2 could mean x² or x₂. so to clear confusion, know the notation. to find the product multiply the x's and you get -8x and the y's and you get 6y. since it's all being multiplied it is just -8x6y, or answer a. although the better answer is -48xy(combining -8 and 6) because you should multiply constants whenever you can.

Ithink that it is 384000