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posted by  GEG on 7/29/2009 12:57:54 PM  |  status: Closed  |  Earned Karma: 25

Intd. Algebra

Course Textbook Chapter Problem Needs by
Algebra Lockwood 7th Ed Chap. 5 N/A N/A
Question Details:
Multiply:     (7  -  5x)(7  +  5x)
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Sage
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posted by rimantas on 7/29/2009 1:14:46 PM  |  status: Live
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Response Details:
recall FOIL   First Outside Inside Last
(a+b)(c+d) =  ac + ad + bc + bd
so    ( 7 - 5x )( 7 + 5x ) = 49 + 35x - 35x - 25x^2 = 49 - 25x^2
hope this helps
Oracle
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posted by wchau on 7/29/2009 1:41:57 PM  |  status: Live
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Response Details:
Using the identity , we have .
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