Question

Помогите прошу умоляю

Answer 1

1.
(5х-1)*(5х+1)<25х^2+2
25х^2-1<25х^2+2
-1<2

а^2-16а+70>0
а^2-92>0
а^2>92
|а|>92
|а|>2 23
а>2 23, а>_0 [2 23; +8)
-а>2 23, а<0 (-8; -2 23]
а€ (-8;-2 23)U(2 23;+8)
2.
3(х+1)-2(2-х)>-11
6(х+1)*(2-х)>-11
(6х+6)*(2-х)>-11
12х-6х^2+12-6х>-11
6х-6х^2+12>-11
6х-6х^2+12+11>0
-6х^2+6х+23>0
-6х^2+6х+23=0
х= 3+7 3/6 х=3-7 3/6
-6(х-3+7 3/6)*(х-3-7 3/6)
(х-3+7 3/6)*(х-3-7 3/6)