Rocks are different than minerals because

Minerals and Rocks are different mainly because of there make up. A mineral is a naturally occurring inorganic element or compound having an orderly internal structure and characteristic chemical composition , crystal form and physical properties. While a rock is an aggregate of one of more minerals , or a body of undifferentiated mineral matter.

343^x = 49^4-xx = 4-xx+x=42x = 4x = 4/2x = 2therefore x = 2