Question

Решите уравнения: 9x²-6-(3x-2)=0 x+(5x+2)²=25(3+x²) (2x-3)²-2x(4+2x)=13 (4x-5)(5+4x)-2x(8x-1)=0

Answer 1

9x² - 6 - 3x + 2 = 0
9x² - 3x - 4 = 0
D = b² - 4ac = 9 + 144 = 153
x1 = ( 3 + √153) / 18
x2 = ( 3 - √153) /18

x + 25x² + 20x + 4 = 75 + 25x²
21x + 25x² - 25x² = 71
21x = 71
x = 71/21
x = 3целых 8/21

4x² - 12x + 9 - 8x - 4x² = 13
- 20x = 13 - 9
- 20x = 4
20x= - 4
x = - 0,2

20x + 16x² - 25 - 20x - 16x² + 2x = 0
2x = 25
x = 12,5