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b. a pangkat 2 - ab - ab + b pangkat dua
c. acx pangkat 2 + adx + bcx + bd
b.(a-b)²=(a-b)(a-b)⇒a²+b²-2ab
c.(ax+b)x(cx+d)⇒acx²+bd+adx+bcx⇒x(acx+ad+bc)+bd