olve the quadratic equation by completing the square

$x^2+5x-8=0$

Choose the appropriate process for rearranging the equation, if needed, before completing the square to obtain an equation of the form $(x+k{)}^2=d$

$($Type an integer or a simplified fraction.$)$

A$.x^2+5x-8=0=>x^2+5x=8=>\frac{1}{5}{x}^2+x+=\frac{8}{5}$

B$.x^2+5x-8=0=>x^2+5x=8=>\frac{1}{5}{x}^2+x+=\frac{8}{5}+$

C$.x^2+5x-8=0=>x^2+5x=8=>x^2+5x+=8$

D$.x^2+5x-8=0=>x^2+5x=8=>x^2+5x+=8+$