find (3+ root 5)(3- root 5)
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(3+√5)(3-√5)=3²-(√5)²=9-5=4
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Hiii
Good morning
(3+ √5 ) ( 3 - √5)
using identity
(a+b) (a-b) = (a)2 - (b)2
---->(3)^2 - (√5) ^2
--->9- 5
===>4 is your answer.
May it is helpful for you.
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