Question

$E(x) = ( \frac{(x+2) ^2}{x ^2 +4} -1) : \frac{x}{x ^2 +4}$

x este nr. real, x≠ 0. Aratati ca E(x) =4

Answer 1

x²+4x+4-x²-4/x²+4xx²+4/x=
4x/x²+4  x   x²+4/x=4x/x=4

Answer 2

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