A2. At which point does the graph of the function $f(x)=2 \log _{\sqrt{2}}(\sqrt{2} x-5)-4$ intersect the x-axis?
(A) $\left(\frac{7 \sqrt{2}}{2}, 0\right)$
(B) $(7 \sqrt{2}, 0)$
(C) $(1-7 \sqrt{2}, 0)$
(D) $\left(\frac{\sqrt{2}}{7}, 0\right)$
(E) $\left(\frac{\sqrt{2}}{2}-7,0\right)$
A2. The prescription of the function $f$ is set to 0. We get the equation $2 \log _{\sqrt{2}}(\sqrt{2} x-5)-4=0$. The solution to the equation is $x=\frac{7 \sqrt{2}}{2}$. The graph of the function $f$ intersects the x-axis at the point $\left(\frac{7 \sqrt{2}}{2}, 0\right)$.