Consider the function \(f(x) = x^2 +2\sqrt{x}\). Evaluate 2f(2) - f(8).
Substitute numbers,
\(\quad2f(2) - f(8) \\= 2(2^2 + 2\sqrt{2}) - (8^2 + 2\sqrt{8})\\=8 + 4\sqrt 2 - 64 - 4\sqrt 2\\ =-56\)
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+865 
