Kathatesmath94
I have a multiple choice question but my answer doesn't match my answer choices... Can someone tell me what i did wrong???
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lilg132
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yes show me what you've done and the question
Kathatesmath94
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|dw:1354239603490:dw|
Kathatesmath94
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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??
lilg132
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the last bit is wrong its not -80 its -40
Kathatesmath94
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oh that was -8sqrt5
lilg132
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-5 + 18 sqrt 5
lilg132
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that last bit is -8 sqrt 5?
lilg132
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it shouldn't be it should be -40
Kathatesmath94
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yeah cause it is 2sqrt5*4sqrt5
lilg132
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yes that should give you - 40
Kathatesmath94
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how did you get-40?? im a little confused
lilg132
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5 * 4 = 20 * -2
lilg132
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= -40
Kathatesmath94
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where does the 5 come from? the sqrt?
lilg132
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yes
Kathatesmath94
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so you take one of the 5's from one of the sqrt and leave the other one?
lilg132
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ok ignore the way i said let me try and explain the way you do it
lilg132
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so we have -2 sqrt 5 * 4 sqrt 5
lilg132
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-2 * 4 = -8
Kathatesmath94
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im sorry I just want to make sure i understand where the 5 comes from
lilg132
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sqrt 5 * sqrt 5 = 5
lilg132
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so we multiply -8 * 5 = -40
lilg132
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is that easier to understand?
Kathatesmath94
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oh so the sqrt * the same swrt will just be the number??
lilg132
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yes
Kathatesmath94
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that makes perfect sense actually
lilg132
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good :)
lilg132
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let me know if your confused about anything
Kathatesmath94
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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
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your welcome =)