Question

qual é o valor numerico da expressao algebrica $\frac{1}{a}$ - a + √a ,quando a = 4 ?

Answer 1

$\frac{1}{a} -a + \sqrt{a} => \frac{1}{4} -4 + \sqrt{4} => \frac{1-16}{4} + \sqrt{4} => -\frac{15}{4} + 2 \\ -\frac{15+8}{4} => -\frac{7}{4}$