Anyone know the answer to this?

Acable car begins its trip by moving up a hill. as it moves up, it gains elevation at a constant rate of 50 feet/minute until it reaches the peak at 2,000 feet. then, as the car moves down to the hill’s base, its elevation drops at the same rate.

Factor this polynomial completely x^2-64

Abcd is a square. what is the measure of angle bac