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energy
Junior Member

USA
4 Posts

 Posted - 10/18/2007 :  18:54:42 4m-49ni am kind of stuck between 2 answers.can someone tell me which one is the right answer. Thank you!!(4m-49n)(4m+49n) or (2m-7n)(2m+7n)

peppers18

124 Posts

 Posted - 10/18/2007 :  19:20:32 try foiling each of them back together and see which one is right

the_hill1962

USA
1469 Posts

 Posted - 10/19/2007 :  07:55:16 Performing FOIL on(4m-49n)(4m+49n)results inFirst 4m4m = 16mOutside 4m49n = 196mnInside -49n4m = -196mnLast -49n49n = 2401nPerforming FOIL on(2m-7n)(2m+7n)results inFirst 2m2m = 4mOutside 2m7n = 14mnInside -7n2m = -14mnLast -7n7n = -49n
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