Jawabanmu

2014-05-22T20:46:19+07:00
Lpermukaan=2((2x+3)3x+(2x+3)(2x-3)+3x(2x-3))
                  =2(6x^2+9x+4x-9+6x^2-9x)
                  =2(12x^2+4x-9)
                  =24x^2+8x-18
         
NOTE: ^2 = pangkat 2 

sorry, if this answer doesn't accurate, thx before
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