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f(x) = x^2-x-20
f(1) = 1^2-1-20
f(1) = 1-1-20
f(1) = 0-20
f(1)= - 20
-------------------------
f(2)=x^2-x-20
f(2) = 2^2-2-20
f(2) = 4-2-20
f(2) = 2-20
f(2) = -18
f(1) = 1^2-1-20
f(1) = 1-1-20
f(1) = 0-20
f(1)= - 20
-------------------------
f(2)=x^2-x-20
f(2) = 2^2-2-20
f(2) = 4-2-20
f(2) = 2-20
f(2) = -18
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