Question

найти область функции 
y=корень 7x+1

Answer 1

$y= sqrt{7x+1} \ \ D(f): 7x+1 geq 0 \ 7x geq -1 \ x geq - frac{1}{7} \ \ E(f): y geq 0$

Answer 2

$sqrt {7x+1}$
$7x+1geq 0;\ xgeq -frac{1}{7}$
$D(f)=[-frac{1}{7};+infty)$