f(x) is a continues function on (-infinity,+infinity) for which(adsbygoogle = window.adsbygoogle || []).push({});

f(x+y)=f(x)+f(y)

prove that there is parameter a for which f(x)=ax for every real x

i was given a hint to solve it for x in Q

there is no much thing i can do here for which i can use theorems

the only thing i am given that its continues

lim f(x)=f(x)

??

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# How to solve this parameter proof

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