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

- anonymous

- schrodinger

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- lilg132

yes show me what you've done and the question

- anonymous

|dw:1354239603490:dw|

- 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

the last bit is wrong its not -80 its -40

- anonymous

oh that was -8sqrt5

- lilg132

-5 + 18 sqrt 5

- lilg132

that last bit is -8 sqrt 5?

- lilg132

it shouldn't be it should be -40

- anonymous

yeah cause it is 2sqrt5*4sqrt5

- lilg132

yes that should give you - 40

- anonymous

how did you get-40?? im a little confused

- lilg132

5 * 4 = 20 * -2

- lilg132

= -40

- anonymous

where does the 5 come from? the sqrt?

- lilg132

yes

- anonymous

so you take one of the 5's from one of the sqrt and leave the other one?

- lilg132

ok ignore the way i said let me try and explain the way you do it

- lilg132

so we have -2 sqrt 5 * 4 sqrt 5

- lilg132

-2 * 4 = -8

- anonymous

im sorry I just want to make sure i understand where the 5 comes from

- lilg132

sqrt 5 * sqrt 5 = 5

- lilg132

so we multiply -8 * 5 = -40

- lilg132

is that easier to understand?

- anonymous

oh so the sqrt * the same swrt will just be the number??

- lilg132

yes

- anonymous

that makes perfect sense actually

- lilg132

good :)

- lilg132

let me know if your confused about anything

- 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

your welcome =)

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