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f(1)=4;and f(x+y)=f(x)+f(y)+7*x*y+2. Find f(2)+f(5)
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Ans is 125
Find f(2)=19
f(3)= f(2+1) = 41
f(5)=f(2+3)=106
f(5)+f(2)=106+19=125
11 years ago
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If f(1)=4 and f(x+y)=f(x)+f(y)+7xy+4,then f(2)+f(5)=?