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= a^2+ab+ab+b^2
= a^2+2ab+b^2
b.(a-b)(a-b)
= a^2-ab-ab+b^2
= a^2-2ab+b^2
c. (ax+b)(cx+d)
= acx^2+axd+bcx+bd
b.(a-b)(a-b)=a²-ab-ab+b²=a²-2ab+b²
c.(ax+b)(cx+d)=acx²+adx+bcx+bd
itu yg c,pd acx², x doang yg di pangkat bukan (acx)²