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b) 25m²-81 = (5m+9).(5m-9)
c) 144p²-36q² = (12p+6q).(12p-6q)
b=(5m)pangkat 2 -9pangkat 2= (5m-9)(5m+9)
c=(12p)pangkat 2 - (6q)pangkat 2=
(12p-6q)(12p+6q)