Browse · MATH Print → jmc algebra intermediate Problem If f(x)=g(g(x))−g(x) and g(x)=2x−1, find f(3). Solution — click to reveal We have f(3)=g(g(3))−g(3). Since g(3)=2(3)−1=5, we have f(3)=g(g(3))−g(3)=g(5)−5=2(5)−1−5=4. Final answer 4 ← Previous problem Next problem →