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Mathematics
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OpenStudy (jazzyfa30):
help plzz
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OpenStudy (jazzyfa30):
OpenStudy (jazzyfa30):
@ganeshie8 hey havent been here in a while can you help
OpenStudy (jazzyfa30):
@phi
OpenStudy (phi):
any idea what they mean by "cube" -5 ?
OpenStudy (jazzyfa30):
-5^3 i think
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OpenStudy (phi):
yes, but I would write it (-5)^3 just to make sure we know we want -5* -5 * -5
(and not - 5*5*5 which gives the right answer, but sometimes it won't)
OpenStudy (phi):
subtract that expression from -8
to do that, I pick a simpler problem
subtract 1 from 3
can you do that ?
OpenStudy (jazzyfa30):
2
OpenStudy (phi):
yes, but how did you get 2 ?
OpenStudy (jazzyfa30):
ohh is it -2
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OpenStudy (phi):
you did it correctly the first time. but I want you to write down how you found 2
for the answer to
subtract 1 from 3
OpenStudy (jazzyfa30):
|dw:1440532728101:dw|
OpenStudy (phi):
take away 1 from 3 ?
how do you do that ?
OpenStudy (jazzyfa30):
yu subtract
OpenStudy (phi):
yes, but write down how to do it
take away 1 from 3
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OpenStudy (phi):
subtract 1 from 3 or take away 1 from 3 means do 3-1
OpenStudy (phi):
the point is to get clear what they mean by
subtract that expression from -8
that means
-8 - expression
where expression is (-5)^3
-8 - (-5)^3
OpenStudy (jazzyfa30):
117
OpenStudy (phi):
-8 - (-5*-5*-5)
-5*-5 is 25. 25*-5= -125
-8 - -125 = -8 + 125 = 117
yes
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