Question

[tex]Aduceti la o forma mai simpla
\sqrt{y ^{2} -10y+25+ \sqrt{y ^{2} -14y+49dcy \geq 7[/tex]

Answer 1

   
$\sqrt{y ^{2} -10y+25}+\sqrt{y ^{2} -14y+49} = \\ = \sqrt{(y +5) ^{2} }+\sqrt{(y -7) ^{2}} = \\ =y+5+y-7= \\ =2y-2 = 2(y-1)$