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T O P I C    R E V I E W
energy Posted - 10/18/2007 : 18:54:42
4m-49n

i 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)
2   L A T E S T    R E P L I E S    (Newest First)
the_hill1962 Posted - 10/19/2007 : 07:55:16
Performing FOIL on
(4m-49n)(4m+49n)
results in
First 4m4m = 16m
Outside 4m49n = 196mn
Inside -49n4m = -196mn
Last -49n49n = 2401n

Performing FOIL on
(2m-7n)(2m+7n)
results in
First 2m2m = 4m
Outside 2m7n = 14mn
Inside -7n2m = -14mn
Last -7n7n = -49n

peppers18 Posted - 10/18/2007 : 19:20:32
try foiling each of them back together and see which one is right

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