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OpenStudy (anonymous):
Simplify each expression. Rationalize all denominators. Assume that all variables are positive. (2-√5)(2+√5)
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OpenStudy (2bornot2b):
4-5=-1
OpenStudy (hoblos):
(a-b)(a+b) = a^2 - b^2 (2-√5)(2+√5) = 4-5 =-1
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