Question

Am nevoie de rezolvarea radicalului, va rog (cel de sus)

Answer 1

y^ -4y +20 = y^ -2*y*2 +4+ 16, deci sub radical este (y-2)^ +16 (16 e 4^ si va fi > sau= decat 4)

^= la patrat

Answer 2

$\sqrt{y^2-4y+20}= \sqrt{y^2-4y+4+16}= \sqrt{(y-2)^2+16}$