х²+64<0
х²<-64
х²+64>0
х²>-64
х²-64>0
(x - 8)(x + 8) < 0;
(x - 8)(x + 8) = 0;
x - 8 = 0;
x = 8;
x + 8 = 0;
x = -8. (-8; 8).
х²+64<0
х²<-64
х²+64>0
х²>-64
х²-64>0
(x - 8)(x + 8) < 0;
(x - 8)(x + 8) = 0;
x - 8 = 0;
x = 8;
x + 8 = 0;
x = -8. (-8; 8).