Challenge for the Weak 1 - P5

Contributed by: cauchy

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Difficulty: 9

This problem is tagged with cw, cw1.

Calculate $\lim_{x \to -\infty} (x + \sqrt{x^2 + 4x})$.
A. $\infty$
B. $-2$
C. $2$
D. $-\infty$
E. Does not exist
F. $0$
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