Докажите неравенство (y-1)(y+1) y^2-2

Question

Докажите неравенство (y-1)(y+1) y^2-2

Comments

И где неравенство?

---

+ к верхнему

Answer 1

(y-1)(y+1)>y²-2

y²-1>y²-2

-1>-2

Answer 2

(y-1)(y+1) = y^2-1
y^2-1>y^2-2