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If f(x) satisfies the relation, f(x+y)=f(x)+f(y) for all x,y `in` R and f(1)=5, then find `sum_(n=1)^(m)f(n)`. Also, prove that f(x) is odd.

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The correct Answer is:
`(5m(m+1))/2`
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  19. If F :[1,oo)->[2,oo) is given by f(x)=x+1/x ,t h e n \ f^(-1)(x) equal...

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  20. Let f(x)=(1+b^2)x^2+2b x+1 and let m(b) the minimum value of f(x)dot A...

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