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Mathematics 21 Online
OpenStudy (anonymous):

Hey you, yes you! You are a very attractive and intelligent person. ;) Would you mind answering some factoring questions for me? I fan and medal. Simplify the product using FOIL (4x-4)(3x-4) Simplify the products with tables (5h+4)(3h+6) (-2+4)(5h+7)

jimthompson5910 (jim_thompson5910):

draw a blank 2x2 table |dw:1362887180709:dw|

jimthompson5910 (jim_thompson5910):

you want to expand out (4x-4)(3x-4) so write 4x and -4 up at the top and write 3x and -4 on the left like this |dw:1362887238761:dw|

jimthompson5910 (jim_thompson5910):

now multiply each header to fill out the table so for instance, 3x and 4x multiply to get 3x*4x = 12x^2

jimthompson5910 (jim_thompson5910):

this goes in the cell where the 4x and 3x intersect, so the upper left cell |dw:1362887302818:dw|

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