X2-0.16>0 очень нужно
Х² -0,16 >0 (x-0.4)(x+0.4)>0 x=0.4 x= -0.4 + - + --------- -0.4 ----------- 0.4 ------------ \\\\\\\\\\ \\\\\\\\\\\\\\ x∈(-∞; -0.4)U(0.4; +∞)