September 2018 1 46 Report
12a²+13a-4
-3+16=13
-3×16=-48
12a²+16a-3a-4
4a(3a+4) -1(3a+4)
(4a-1) (3a+4)
jika caranya begini maka angka 4a dan -1 itu dari mana dapatnya

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