| What must be added to the following expression to make it a perfect square? |
| \[\frac{3{{x}^{2}}}{64}-5\frac{\sqrt{21x}}{12}+\frac{157}{9}\] |
A) \[\frac{21}{9}\]
B) 1
C) 2
D) \[\frac{33}{9}\]
E) None of these
Correct Answer: C
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