Question

решите неравенства
a) x^3 – 81х ≤ 0
b) х^2 < 16
c) (х – 5)(х + 5) ≤ (х – 3)^2 + 2.
d) x^2(х + 8) (х – 4)^3(х – 7) ≤ 0

Answer 1

(х-5)(х+5)<(х-3)^2+2    b) x^2<16
x^2-25<x^2-6x+9+2          x<4
x^2-x^2+6x<11+25
6x<36
x<6