Quantitative Comparison•hard

Quantitative Comparison: (x + 3)² vs. x² + 9

Given that $x$ is a real number, compare the two quantities.

Quantity A: $(x + 3)^2$

Quantity B: $x^2 + 9$

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Quantitative Comparison•hard

Given that $x$ is a real number, compare the two quantities.

Quantity A: $(x + 3)^2$

Quantity B: $x^2 + 9$