Find a Function F(x, Y, Z)whose Level Surface at Level $h ( x , y ) = 5 x ^ { 2 } y + 5 y - 1$

Essay

Find a function f(x, y, z)whose level surface at level 4 is the graph of the function $h ( x , y ) = 5 x ^ { 2 } y + 5 y - 1$ .