Question

Qual é o valor da expressão algébrica √x + 1/x - x,quando x = 4

Answer 1

$\Large\boxed{\begin{array}{l}\sf\sqrt{x}+\dfrac{1}{x}-x,~para~x=4\\\\\sf \sqrt{4}+\dfrac{1}{4}-4\\\\\sf 2+\dfrac{1}{4}-4=\dfrac{8+1-16}{4}=-\dfrac{7}{4}\end{array}}$