Question

51. If F: R - R satisfies f(x + y) = f(x) + f(y). for all my e R and f(i) fu, = 7 then (r) is​

Answer 1

Answer:

f(1)=7

f(1+1)=f(1)+f(1)

f(2)=2×7

only f(3)=3×7

∑r=1nf(r)=7(1+2+………+n)

=7n(n+1)2.

Step-by-step explanation:

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Answer 2

Answer:

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