Practice problem
Given that f(x)=xf(x−1)f(x) = x f(x - 1)f(x)=xf(x−1), g(x)=(x+1)g(x−1)g(x) = (x + 1) g(x - 1)g(x)=(x+1)g(x−1), f(1)=7f(1) = 7f(1)=7, and g(1)=3g(1) = 3g(1)=3, calculate (f+g)(4)(f + g)(4)(f+g)(4).
144144144
348348348
528528528
133713371337
Type a concept, like “slope” or “photosynthesis”.