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thanks a lot, my carelessness
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thanks ok find the answer ("1") but in the test answer is 5/4 and teachers says it's correct
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1. f(x)=-x2+4x-5 (parabola)
What's the maximum value of "f(x)+x"?
sorry for my english :)
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mathematica it's best for this and more
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wow, i don't have any idea you can calculate with known ways
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feynmann, einstein, john nash and neumann