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Question: Question about plot3d bad range arguments!!

Question:Question about plot3d bad range arguments!!

Donglee Hong 5 Maple
plot3d
July 31 2018
1

x1=ginseng, x2=grape, f1=preference;
> x1:=5;
> f1:=3.579167+3.537500*x1-2.645833*x2-0.250000*x1*x1-0.012500*x2*x1+0.175000*x2*x2;
> plot3d (f1, x2=3..7, labels=[grape, preference], axes=boxed);

 

Error, (in plot3d/expression) bad range arguments: .8 = 3 .. 7, labels = [grape, preference]

 

The error was found! Please help!!!
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