guppy08
guppy08 guppy08
  • 15-11-2016
  • Mathematics
contestada

factor: 3x^2+2x-21=0

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SugaBear1993
SugaBear1993 SugaBear1993
  • 18-11-2016
(3x-7)(x+3)               

FOIL
3x*x=3x^2
3*3x+-7*x=2x
-7*3=-21
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