(-2m+3)( )=4m²-9 ;(-2ab+3)²= .

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(-2m+3)( )=4m²-9 ;(-2ab+3)²= .

(-2m+3)(-2m-3 )=4m²-9
(-2ab+3)²=4a²b²-12ab+9

(-2m+3)(-2m-3 )=4m²-9
(-2ab+3)²=4a²b²-12ab+9