3.
[tex]( \sqrt{18x} ) {}^{2} = (3x - 2)(3x + 5) \\ 18x = 9 {x}^{2} + 9x - 10 \\ 9 {x}^{2} - 9x - 10 = 0 \\ 81 + 360 = 441 \\ \sqrt{441} = 21 \\ x = \frac{9 + 21}{18} = \frac{5}{3} \\ x = \frac{9 - 21}{18} = - \frac{2}{3} \\ [/tex]
4. os X:
[tex]6x + 3 = 0 \\ 6x = - 3 \\ x = - \frac{1}{2} [/tex]
punkt :
[tex]( \frac{1}{2} 0)[/tex]
oś Y
[tex]6 \times 0 + 3 = y \\ y = 3[/tex]
punkt:
[tex](0 \: 3)[/tex]
