document.write( "Question 214031: if f(a+b) = f(a) + f(b) for all real numbers. Show how f(2a) = 2*f(a) and show how f(0) = 0. \n" ); document.write( "

Algebra.Com's Answer #161676 by HyperBrain(694) $\"\"$ $\"About$

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f(a+b) = f(a) + f(b)
\n" ); document.write( "Replace b with a:
\n" ); document.write( "f(a+a)=f(a)+f(a)
\n" ); document.write( "f(2a)=2*f(a) \n" ); document.write( "

\n" );