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1. The function $f(x)=x^2+4x+2$ is special. Why?

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	1. The function <math>f(x)=x^2+4x+2</math> is special. Why?		1. The function <math>f(x)=x^2+4x+2</math> is special. Why?
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−	~~2. Find the <math>?</math> in the sequence <math>10, 21, 12, 9, 1, 14, 8, 21, 1, 14, ?</math>.~~