3ax²-3ay²

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3ax²-3ay²
3ax²-3ay²

3ax²-3ay²
3ax²-3ay²
=3a(x²-y²)
=3a(x+y)(x-y)

3a(x+y)(x-y)

=3a(X平方-Y平方)=3a(X+Y)(X-Y)