(x to the -3/2 power) to the 4/3 power

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If f(x)=2x-6 and g(x)=3x+9, find (f-g)(x)

Me, prove a quadrilateral with vertices g(1,-1), h(5,1), i(4,3) and j(0,1) is a rectangle using the parallelogram method and a rectangle method.