Question

y=x+3 деленое на x²-25
Найти: D(y)

Answer 1

$y=frac{x+3}{x^2-25} = frac{x+3}{(x-5)(x+5)}\\ x neq 5\ x neq -5\\ x in (-infty;-5)cup (-5;5) cup (5; +infty)$