Odpowiedź:
2x (3 + 5) = 2x - (2 + 7x)
6x + 10x = 2x - 2 - 7x
16x = - 5x - 2
21x = - 2
3x (2 + 3) = 3 (7x + 2)
6x + 9x = 21x + 6
- 6x = 6
x = -1
10 (5x + 3) = (x + 2)(x + 2)
50x + 30 = x² + 4x + 4
0 = x² - 46x - 26
Δ = 2116 + 104 = 2220
[tex]\sqrt{\Delta} = \sqrt{2220} = 2\sqrt{555}[/tex]
[tex]x = \frac{46 - 2\sqrt{555}}{2 * 1} \ \ \ \ \ \vee \ \ \ \ \ x = \frac{46 + 2\sqrt{555}}{2*1}[/tex]
[tex]x = \frac{46 - 2\sqrt{555}}{3} \ \ \ \ \ \vee \ \ \ \ \ x = \frac{46 + 2\sqrt{555}}{3}[/tex]
2x - (3x + 2) = 7 - (7x + 7)
2x - 3x - 2 = 7 - 7x - 7
6x = 2
[tex]x = \frac{2}{6} = \frac{1}{3}[/tex]