anonymous
  • anonymous
I have a multiple choice question but my answer doesn't match my answer choices... Can someone tell me what i did wrong???
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
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lilg132
  • lilg132
yes show me what you've done and the question
anonymous
  • anonymous
|dw:1354239603490:dw|
anonymous
  • anonymous
thats the answer i chose but it says it is wrong.... my answer choices are: -5+18sqrt5 -5+38sqrt5 35+20sqrt5 35+10sqrt5--- the answer i chose and it says it is wrong... I am not sure why or what i did wrong can someone please help??

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More answers

lilg132
  • lilg132
the last bit is wrong its not -80 its -40
anonymous
  • anonymous
oh that was -8sqrt5
lilg132
  • lilg132
-5 + 18 sqrt 5
lilg132
  • lilg132
that last bit is -8 sqrt 5?
lilg132
  • lilg132
it shouldn't be it should be -40
anonymous
  • anonymous
yeah cause it is 2sqrt5*4sqrt5
lilg132
  • lilg132
yes that should give you - 40
anonymous
  • anonymous
how did you get-40?? im a little confused
lilg132
  • lilg132
5 * 4 = 20 * -2
lilg132
  • lilg132
= -40
anonymous
  • anonymous
where does the 5 come from? the sqrt?
lilg132
  • lilg132
yes
anonymous
  • anonymous
so you take one of the 5's from one of the sqrt and leave the other one?
lilg132
  • lilg132
ok ignore the way i said let me try and explain the way you do it
lilg132
  • lilg132
so we have -2 sqrt 5 * 4 sqrt 5
lilg132
  • lilg132
-2 * 4 = -8
anonymous
  • anonymous
im sorry I just want to make sure i understand where the 5 comes from
lilg132
  • lilg132
sqrt 5 * sqrt 5 = 5
lilg132
  • lilg132
so we multiply -8 * 5 = -40
lilg132
  • lilg132
is that easier to understand?
anonymous
  • anonymous
oh so the sqrt * the same swrt will just be the number??
lilg132
  • lilg132
yes
anonymous
  • anonymous
that makes perfect sense actually
lilg132
  • lilg132
good :)
lilg132
  • lilg132
let me know if your confused about anything
anonymous
  • anonymous
thank you soo much for explainging it and not just giving me the answer. if I have any other problem I will post them for sure. I really appreciate it
lilg132
  • lilg132
your welcome =)

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