Question

E(x) = [(x+2$)^{2}$-1]   :x
        $x^{2}$+4      $x^{2}$+4

Answer 1

[tex] [\frac{ (x+2)^{2} }{ x^{2} +4} -1] \frac{ x^{2} +4}{x} = \frac{ x^{2} +4x+4- x^{2} -4}{ x^{2} +4} \frac{ x^{2} +4x}{x} = \frac{4x}{x} =4[/tex]