Question

Imaginea funcției f:R→R,f(x)=x2+x+5 este??

Answer 1

Hei! :)

$f(x)=x^{2} +x+5$

$a=1>0\\b=1\\c=5\\delta=b^{2} -4ac=1-20=-19\\=> Im(f)=[\frac{-delta}{4a} , +infinit]=[\frac{20}{4} ,+ infinit]\\=> Im(f)=[5, +infinit]$