Question: ( a ) Show that the function f ( x 1 , x 2 ) = A x 1 x 2 , A > 0

(a) Show that the function f(x1,x2)=Ax1x2,A>0,,>0 is quasi-concave. Also, show that it is concave only if +1.
(a) Show that the function f(x1,x2)=Ax1x2,A>0,,>0 is quasi-concave. Also, show that

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