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I have a multiple choice question but my answer doesn't match my answer choices... Can someone tell me what i did wrong???

Mathematics
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yes show me what you've done and the question
|dw:1354239603490:dw|
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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Other answers:

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

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