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Explain why: x2 + 4 >= 4x for all real x.

Explain why: x2 + 4 >= 4x for all real x.
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5 votes
Explain why: x2 + 4 >= 4x for all real x.

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User Arbaz Irshad
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7.9k points

1 Answer

5 votes

Answer:

x² + 4 > 4x

x² - 4x + 4 > 0

(x - 2)² > 0 (true for all real x)

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User Nikola Kirev
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7.9k points
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