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How do you know that x²-8x+20 is always positive?
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5 votes
How do you know that x²-8x+20 is always positive?

User Patrine
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1 Answer

6 votes

Answer:

x² - 8x + 20 = x² - 8x + 16 + 4

= (x - 4)² + 4 ≥ 4

User Shakir Khan
by
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