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OpenStudy (lokiando):
Easy question! Which is a difference of cubes? a) x^6 – 27 b) x^15 – 36 c) x^16 – 64 d) x^5 – 125
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OpenStudy (skullpatrol):
Any ideas?
OpenStudy (lokiando):
this is an example
OpenStudy (lokiando):
c
OpenStudy (lokiando):
x^16-64
OpenStudy (skullpatrol):
why?
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OpenStudy (lokiando):
8*8=64
OpenStudy (skullpatrol):
how does that fit the pattern of being a "difference of cubes"?
OpenStudy (skullpatrol):
|dw:1438203365119:dw|
OpenStudy (lokiando):
its D
OpenStudy (skullpatrol):
why?
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OpenStudy (lokiando):
because 5^3=125
OpenStudy (skullpatrol):
prove it by writing it as a difference of cubes
OpenStudy (skullpatrol):
you are right 5^3 = 125, but what about x^5?
OpenStudy (lokiando):
0
OpenStudy (skullpatrol):
|dw:1438203688682:dw|
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