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energy
Junior Member

USA
4 Posts
Posted - 10/18/2007 :  18:54:42  Show Profile  Reply with Quote
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)
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peppers18
Advanced Member

Canada
124 Posts
Posted - 10/18/2007 :  19:20:32  Show Profile  Reply with Quote
try foiling each of them back together and see which one is right
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the_hill1962
Advanced Member

USA
1440 Posts
Posted - 10/19/2007 :  07:55:16  Show Profile  Reply with Quote
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
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