a-1/a =3 .find:a+1/a
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Answer:
a-1/a=3
a/a-1/a=3
-a=3
a=-3
a+1/a=-3+1/-3
9+1/-3
=-10/3
Step-by-step explanation:
Answered by
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Step-by-step explanation:
a^2-1 = 3a
a^2-3a-1 = 0
a1 = (3+√13)/2
a2 = (3-√3)/2
(a-1)(a+1) = 3a
(a^2 + 1 ) / a = (2+3a)/a = 3+2/a
= 3+4/(3+√13) = (9+3√13+4)/(3+√13)
= (13+√13)/(3+√13)
= 3+4/(3-√13) = (9-3√13+4)/(3-√13)
= (13-√13)/(3-√13)
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