Решите неравенства (3х-1)^2-7(5-4х)^2-1

Question

Решите неравенства (3х-1)^2-7<(9х+2)х+2 2х(8х+3)+1>(5-4х)^2-1

Answer 1

1) (3х-1)^2-7<(9х+2)х+2</p>

9х^2-6х+1-7<9х^2+2х+2</p>

1-7-2<2х+6х</p>

-8<8х</p>

х>-1

2) 2х(8х+3)+1>(5-4х)^2-1

16х^2+6х+1>25-40х+16х^2-1

6х+1>25-40х-1

6х+40х>25-1-1

46х>23

х>0.5