Mathematics: What is the lcm and gcf for 15 and 60

aStep-by-step explanation Option 1: Plug 4 into g ( x ) : g ( x ) = − 2 ( 4 ) − 6 = − 8 − 6 = − 14 Then plug g ( x ) into f ( x ) : f ( x ) = 3 ( − 14 ) − 7 = − 42 − 7 = − 49 Option 2: Plug g ( x ) into f ( x ) : f ( x ) = 3 ( − 2 x − 6 ) − 7 = − 6 x − 18 − 7 = − 6 x − 25 Finally plug 4 into our current f ( x ) : f ( x ) = − 6 ( 4 ) − 25 = − 24 − 25 = − 49...