To complete the function, we need to find the missing terms. We know that the larger number is x + 56, so we can write:
f(x) = x(x + 56)
To expand this expression, we can use the distributive property of multiplication:
f(x) = x^2 + 56x
Therefore, the missing term is 56. Our completed function is:
f(x) = x^2 + 56x