anonymous
  • anonymous
Simplify (2-sqroot8) (3+sqroot2) can someone show me this?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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lgbasallote
  • lgbasallote
FOIL works good. multiply the: F - first terms O - outside terms I - inner terms L -last terms tell me what you got :D
saifoo.khan
  • saifoo.khan
|dw:1333294193708:dw|
lgbasallote
  • lgbasallote
last term invi saif :p

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anonymous
  • anonymous
can someone write their results so i can compare mines?
saifoo.khan
  • saifoo.khan
Sure. what'd you got?
hoblos
  • hoblos
(2-√8)(3+√2) = 6 +2√2 -3√8 - √16 = 6 +2√2 - 3√(4*2) - √4² = 6 +2√2 - 3√(4*2) - 4 = 2 + 2√2 -6√2 = 2 -4√2
lgbasallote
  • lgbasallote
sqrt (16) = +/- 4 though so you might wanna consider that :DDD @hoblos
hoblos
  • hoblos
a good note @lgbasallote !! thanks i assumed we dont need the negative part so @gkdefined if you want to consider the negative you will have 4 answers 2 cases for √16 =± 4 2 cases for √4 = ± 2
anonymous
  • anonymous
too bad i do not understand what your writing -.-
hoblos
  • hoblos
do you know that √16=|4|=±4
anonymous
  • anonymous
i know that square root of 16 is 4 but why is 4 = +-4?
hoblos
  • hoblos
well thats by the definition of radicals.. to make it clearer notice that 4^2=16 and (-4)^2 = 16 so √16 can be either 4 or -4
anonymous
  • anonymous
ohh so for this one √4² u square it = √16 and then u square root it?
hoblos
  • hoblos
you can do that but notice that 4² = (-4)² anyway if you are not using ± in school just do it the way you know and choose the positive answer ;)
anonymous
  • anonymous
what happened here? 3√(4*2

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