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How is x^2-8x+20 always positive

How is x^2-8x+20 always positive
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How is x^2-8x+20 always positive

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User Tom Michew
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There are no real values of x that will make this expression have any value less than 4, a positive number.
How is x^2-8x+20 always positive-example-1
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User Kiran Kotturi
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