#769 · Algebra · Functional equations

An additive function

$f$ satisfies $f (x + y) = f (x) + f (y)$ for all reals, and $f (1) = 3$ . Find $f (5)$ .

~3 minAnswer checked instantlyFunctional equations

Stuck? A gentle nudge

Something off?

Workspace

Your answer

Loading the math keyboard…

Type naturally — sqrt, pi, / and ^ become notation. Any equivalent form is accepted. Press Enter to check.