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OpenStudy (anonymous):
How do I prove that 4x > x^2 + 8 is always false?
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OpenStudy (ali2x2):
use wolfram alpha or tiger algebra.
OpenStudy (amistre64):
show the determinant is a negative value
OpenStudy (amistre64):
...discriminant; soo many d words
OpenStudy (amistre64):
or .... maybe the minimum?
OpenStudy (amistre64):
is x^2 -4x +8 < 0?
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OpenStudy (amistre64):
if its minimum is bigger than 0, then it can never be less then 0 can it?
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