(2а-5)^2 - (2a+3)^2 = -80
4a^2 - 20a +25 - 4a^2 - 12a - 9 + 80 = 0
- 32a = -96
a = 3
9a² - b² - 24a + 16 = ( (3a)² - 24a - b² ) + 16 = (3a - b)( 3a + b) + 16 =
= ( 3a - b - 4)( 3a + b - 4)
5x-(3+2x-2x²)=2x²-7x+17;
5x-3-2x+2x²=2x²-7x+17;
5x-2x+2x²-2x²+7x=3+17;
10x=20;
x=2
{x<3 {x<3 {x<3
4-x>0 -x>-4 x<4
\ \ \ \ \ \ \ \ \
--------------|-----------|--------------->x
3 4
/ / / / / / / / / / / / / / / /
ответ:
| | | | | | | |
------------|-------------------->x
3
x∈(-∞;∞)
4x³ * (- 2x²)³ = 4x³ * (- 8x⁶) = - 32 x³⁺⁶ = - 32x⁹