Question

$x={\left(\frac{5}{7}\right)}^{-5}\times {\left(\frac{7}{5}\right)}^{-7}$ then find the value of 2x + 1

Answer 1

$x={\left(\frac{5}{7}\right)}^{-5}\times {)}^{-7}$

$={\left(\frac{5}{7}\right)}^2$

$2x+1=2\times \frac{25}{49}+1$

$=\frac{99}{49}$