Question

Х^2-(9-х)^2>-2х решите неравенство

Answer 1

$20x-81 textgreater 0$
$20x textgreater 81$
$x textgreater frac{81}{20}$
©UmnyjChuvak

Answer 2

x²-(9-x)²>-2x
x²-81+18x-x²+2x>0
20x>81
x>81/20
x>4.05