Not sure why this is supposed to be hard. Apollonius's theorem works as it's intended to here. AB^2+AC^2=2AD^2+2BD^2 https://www.wolframalpha.com/input?i=5%5

Not sure why this is supposed to be hard. Apollonius's theorem works as it's intended to here. AB^2+AC^2=2AD^2+2BD^2 https://www.wolframalpha.com/input?i=5%5E2%2B3%5E2%3D2x%5E2%2B2*4%5E2 https://www.wolframalpha.com/input?i=5%5E2%2B3%5E2%3D2x%5E2%...