ChallengeMedium ShareChallenge · Medium problemA function fff satisfies f(m+n)+f(m−n)=2f(m)+2f(n)f(m+n)+f(m-n)=2f(m)+2f(n)f(m+n)+f(m−n)=2f(m)+2f(n) for all reals m,nm,nm,n, and f(1)=3f(1)=3f(1)=3. Find f(5)f(5)f(5).Check Show answer Walk through it step by step Practice more like this