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=14x-49-4x²+14x
=-4x²+28x-49
maap kalo salah wkwkw
=-4xkuadrat+28x-49=0
Cara menghintungnya
Ibaratkan (a-b)×(c-d)
a×b lalu a×c lalu b×c terakhir b×d.
Tolong jadikan yang terbaik..