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(35x+16y)-(21x+28y)
= 35x-21x + 16y-28y
=-14x-12y
semoga membantu :-)
= (35x . -21x)+(35x . 28y)+(16y . -21x)+(16y . 28y)
= -735x pangkat 2 + 980xy + (-336xy) + 448 y pangkat 2
= -735x pangkat 2 + 644xy + 448y pangkat 2
Maaf kalo salah