1) х^2+16x+64-x^2 < 11x
5x < -64
x < -64 \ 5
2) x^2 - ( 81 - 18x + x^2 ) > -2x
-81 + 18x > -2x
20x > 81
x > 81\20
3) (12+x)^2 > x^2+ 21X
144 + 24x + x^2 > x^2 + 21x
3x > 144
x > 144\3
4) x^2 < (25 - x)^2 + 25x
x^2 < 625 - 50x + x^2 + 25x
25x < 625
x < 625\25
5) 24y^2 + (8+y)^3 + y^3 < 0
24y^2 + 512+ 128y - 24y^2 - y^3 + y^3 < 0
y < -(512/128)