Solve for x please help me!!

Factor this polynomial completely x^2-64

In right ∆abc shown below, the midpoint of hypotenuse ac is located at d and segment bd is drawn. if ab = 12 and bc = 16, then explain why bd = 10. hint: consider what you know about the diagonals of a rectangle.

For what value of (y) is 3^3/3^y =1/9