In calculus, we study an operation on functions like f (x ) called integration denoted f (x) dx . Let a and k represent real numbers, then freshmen calculus students learn two rules of integration. First, J (f ( x) + 8(x) ) dx =ff(x) dx+fg(x) dx. k Second, dx = kInxta. x+a Use these two facts to perform the integration below. 2x-1 -dx x'- x-6