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f(a+b)=f(a)+f(b)+4ab\large f(a+b)=f(a)+f(b)+4abf(a+b)=f(a)+f(b)+4ab
The functional equation above is true for all real numbers aaa and bbb. Find the value of f(4)f\left( 4 \right)f(4), given that f(−4)=40f\left( -4 \right) =40f(−4)=40.
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