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kalau itu 10 dikali, hasilnya: 20y-100
b. 5x pangkat 2 -x +25x -5
= 5x pangkat 2 +24x - 5
c. 14x - 49 - 4x pangkat 2 +14 x
= 14x + 14x - 4x pangkat 2 -49
= 28x -4x pangkat 2 -49
Maaf jika salah, hanya bisa membantu segini aja :)