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11-06-2014
Mathematics

contestada

Find all real numbers x such that
x^4 ≤ 8x^2 − 16.

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konrad509 konrad509

11-06-2014

[tex] x^4 \leq 8x^2 -16\\ x^4-8x^2+16\leq0\\ (x^2-4)^2\leq0\\ x^2-4=0\\ x^2=4\\ x=-2 \vee x=2[/tex]

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