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OpenStudy (anonymous):
Proof that 4x^3+4x^2+2>=7 (x>=-2).
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OpenStudy (anonymous):
\[ 4x^3+4x^2+2>=7 \\ 4x^3+4x^2-5>=0 \\ \]Factor it. Each factor will be greater than 0. Then it will be easy to show.
OpenStudy (anonymous):
OK. Im gonna try that. Thanks!
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