simplify (root3-root5) (root5+root3) / 7-2root5
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(root3-root5) (root5+root3) / 7-2root5
= root3^2 - root5^2
= 3 - 5
therefore: 3 - 5/ 7-2root5
= -2/ 7- 2root5
= -2 ( 7+ 2root5 ) / 29
= -14 - 4root5 / 29
simplify and the answer is - (14 + 4root5 / 29)
hope this helps
:)
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