Let f(x) = 5x + 2 and g(x) = 2x - 1 how do you find (fog)(x)? Precalculus Functions Defined and Notation Function Composition 1 Answer Bill K. Jul 30, 2015 #(f circ g)(x)=10x-3# Explanation: Just plug the formula for #g(x)# into the formula for #f(x)# (so replace #x# in the formula for #f(x)# with what #g(x)# equals), then simplify: #(f circ g)(x)=f(g(x))=f(2x-1)=5(2x-1)+2=10x-5+2=10x-3#. Answer link Related questions What is function composition? What are some examples of function composition? What are some common mistakes students make with function composition? Is function composition associative? Is it always true that #(f@g)(x) = (g@f)(x)#? If #f(x) = x + 3# and #g(x) = 2x - 7#, what is #(f@g)(x)#? If #f(x) = x^2# and #g(x) = x + 2#, what is #(f@g)(x)#? If #f(x) = x^2# and #g(x) = x + 2#, what is #(g@f)(x)#? What is the domain of #(f@g)(x)#? What is the domain of the composite function #(g@f)(x)#? See all questions in Function Composition Impact of this question 15792 views around the world You can reuse this answer Creative Commons License