if a - 1/a =underroot 5 find a+1/a and a^3 + 1/ a^3
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(a +1/a )^2 =
(a+1/a)^2 - (a -1/a)^2 = 4 (a*1/a)
(a+1/a)^2-(√5)^2 = 4
(a+1/a)^2 - 5=4
(a+1/a)^2 =5+4
(a+1/a)^2 = 9
(a+1/a) = √9
= 3 - (Answer)
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it is the definitely correct answer
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