TeX Quellcode:

\begin{array}{rclll}\sqrt{4-x}+2 &=& 4 &\vert & \left(\right)^2 \\\left(\sqrt{4-x}+2\right)^2 &=& 16 \\4-x+2\cdot\sqrt{4-x}\cdot 2+4 &=& 16 \\4\sqrt{4-x}-x+8 &=& 16 &\vert & \left(\right)^2 \\ \left(4\sqrt{4-x}-x+8\right)\left(4\sqrt{4-x}-x+8\right) &=& 256 \\16(4-x)-4x\sqrt{4-x}+4\cdot 8\sqrt{4-x}-4x\sqrt{4-x}+x^2-8x+8\cdot 4\sqrt{4-x}-8x+64 &=& 256 \\(-8x+64)\sqrt{4-x}+x^2-32x+128 &=& 256 \\&\dots&\end{array}