Need , can someone  factor completely u^4-256v^4

What is the approximate total length of iron edging needed to create the square frame and the two diagonals?

While scuba diving, rajeev dove to a depth of 12.6 feet below the surface of the water and then descended another 8.7 feet. what expression can be used to find rajeev's new position? 12.6 – 8.7 –12.6 – 8.7 –12.6 – (–8.7) 12.6 – (–8.7)

What is a graph with a never ending line called?