(Algebra) Onde estou errando? Sendo x um número real, tal que x + 1/x = 3, obtenha os valores numericos de:
a) x^2 + 1/x^2

Se,
x + 1/x = 3
x^2/x = 3
x = 3

logo,
x^2 + 1/x^2
3^2 + 1/3^2
9 + 1/9
82/9
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