TeX Quellcode:

\begin{array}{rclcl}0 &=& \log_7\left(6x^2+12x-17\right) &\vert& 7^* \\1 &=& 6x^2+12x-17 &\vert& -1 \\0 &=& 6x^2+12x-18 &\vert& :6 \\0 &=& x^2+2x-3 &\vert& \text{p-q-Formel} \\x_{1,2} &=& -1\pm\sqrt{1+3} \\&=& -1 \pm \sqrt{4} \\\\x_1 &=& -1+2 = 1\;\in\;\mathbb{D} \\x_2 &=& -1-2 = -3\;\in\;\mathbb{D}\end{array}