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6a²+12ab-8ab-8b²
6a²+4ab-8b²
= (3a*2a)+(3a*4b)-(4a*2b)-(4b*4b)
= 6a^2 + 12ab - 8ab - 16b^2
= 6a^2 + 4ab - 16b^2
#tanda yang ^ artinya pangkat yaa