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OpenStudy (anonymous):
a,b and c real numbers Prove (a+b+c)² <= 3(a²+b²+c²)
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OpenStudy (joannablackwelder):
@nincompoop Thoughts?
OpenStudy (anonymous):
ok
OpenStudy (joannablackwelder):
I'm not sure other than proving by examples. How thoroughly are you expected to prove this?
OpenStudy (anonymous):
?
OpenStudy (anonymous):
anything
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OpenStudy (joannablackwelder):
I can't find any values for a, b, and c that disprove it. Plug in numbers.
OpenStudy (anonymous):
it's hardy
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