Question

raiz qua drada de 5x-1=7

Answer 1

5x - 1 = 7
5x = 8
x = 8/5 
x = 1,6

$\sqrt{1,6} = \sqrt{\frac{16}{10}} = \frac{4}{ \sqrt{10}}. \frac{ \sqrt{10} }{\sqrt{10}} = \frac{4 \sqrt{10} }{10}$