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9x^2 +12xy-12xy-16y^2
9x^2-16y^2
B) (3x+4y)(3x-4y)
9x^2-12xy+12xy-16y^2
9x^2-16y^2
#Maaf kalau salah
=9x^2-24xy-16y^2
B.B*A=(3x+4y)(3x-4y)
=9x^2xy-16y^2