tolong bantu jawab dengan cara nya ya

[tex]1a. \: {x}^{2} + 12x - 5 = 0 \\ 1b. \: 10x + 27 = 0 \\ 1c. \: {x}^{2} - x - 11 = 0 \\ 2a. \: x1 = 2 \: \: x2 = - 3 \\ 2b. \: x1 = \frac{1}{2} \: \: x2 = \frac{1}{3} \\ [/tex]