What are the domain restrictions of q^2-3q-4/q^2-7q-8

You are assembling pieces of an iron gate to complete a fence. the finished gate will look like the one below. in order to assemble the gate it is important to under how the pieces are related. part 1: how are pies 1 and 2 in the archway related? part 2: how are the rectangular sections 5 and 6 in the center of the gate related to each other?

Evaluate the expression for the given value of the variable. 5×(h+3) for h=7

Which one is true about the hexagons ?