Verify the parallelogram law for vectors u and v in r^n: ||u + v||^2 + ||u - v||^2 = 2||u||^2 + 2||v||^2

Does anyone know how to do geometryme with this problem

What is the solution to the equation below? 3/x-2+6=square root x-2 +8

Johnny rode his bike to a friends house 4 blocks down the street in his neighborhood. he immediately rode back home once he realized his friend was unable to play. what was his displacement for the total bike ride trip? what could you use as a reference point ? show the steps to solve this problem.