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How do you know that x^2-8x+20 is always even

How do you know that x^2-8x+20 is always even
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How do you know that x^2-8x+20 is always even

User Theuniverseisflat
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i think it is because all of the numbers in the equation are even i think do not trust me on this 
User Kevinwmerritt
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