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OpenStudy (anonymous):
If x^2-16>0, which of the following must be true?
a.. -4>x>4 b.. -4>x<4 c.. -4
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OpenStudy (anonymous):
use the hint |dw:1350223981903:dw| so x^2 - 16 > 0 x^2 > 16 solve this by taking square root
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