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cek 4x3 2(4+3)-2=24-2=22
6x2 2(6+2)-2=16-2=14
12x1 2(12+1)-2=26-2=24
maksimum 24 dan minimum 14
misalkan hasilnya x
2(a+b) -2=x
2a+2b = 2+x
2(a+b)=2+x
a+b= 2+x / 2 kuadratkan
(a+b)²-2ab= 4+4x+x²/4
(a+b)²-2(12)= 4+4x+x² / 4
(a+b)² -24 = 4+4x+x² / 4 kalikan 4
rancu
maksimumnya 24 dan minimumnya 14 apakah benar