Factor the polynomial expression by grouping. 
Definitions:
Karst
A landscape formed from the dissolution of soluble rocks such as limestone, characterized by sinkholes, caves, and underground rivers.
Iron and Aluminum
Essential metals abundant in the Earth's crust, often forming various minerals and playing crucial roles in industrial applications.
Leached
Leached describes the process by which soluble nutrients or chemicals are washed out of soil or materials due to the movement of water.
Tropical Climate
A non-arid climate characterized by consistent high temperatures throughout the year, usually found within 23.5 degrees north or south of the equator.
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