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OpenStudy (anonymous):
(7 minus 2 square root of 5)(5 plus 4 square root of 5) HELLPPPPPP
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OpenStudy (anonymous):
35+18sqrt5-40 =-5+18sqrt5
OpenStudy (campbell_st):
\[(7 - 2\sqrt{5})(5+4\sqrt{5})\] its binomial expansion lots of ways to do it |dw:1327559245628:dw| collect like terms
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