Question

найти область определения функции у =√5-х² -4х /√х +4

Answer 1

{5-x²-4x≥0
{x+4>0
x+4>0⇒x>-4
x²+4x-5≤0
x1+x2=-4 u x1*x2=-5
x1=-5 U x2=1
             +               _               +
--------------[-5]-----(-4)-----------[1]--------------
                              \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\
x∈(-4;1]