Resposta :
5x - 1 = 7
5x = 8
x = 8/5
x = 1,6
[tex]\sqrt{1,6} = \sqrt{\frac{16}{10}} = \frac{4}{ \sqrt{10}}. \frac{ \sqrt{10} }{\sqrt{10}} = \frac{4 \sqrt{10} }{10} [/tex]
5x = 8
x = 8/5
x = 1,6
[tex]\sqrt{1,6} = \sqrt{\frac{16}{10}} = \frac{4}{ \sqrt{10}}. \frac{ \sqrt{10} }{\sqrt{10}} = \frac{4 \sqrt{10} }{10} [/tex]