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a.A2 - B2 =28
b.(A+B)(A-B)= kalo A+B=11 dan kalo A-B=28
PENJELASANNYA:
JIKA (A+B)
=(A+B²)-2ab
=11²-2(28)
=121-56
=65
itu penjelasan nya A-B dan A+B YA