A) \[\frac{3}{7}{{x}^{2}}-\frac{1}{2}{{y}^{2}}+\frac{3}{7}xy\]
B) \[\frac{3}{7}{{x}^{2}}+\frac{3}{7}xy+\frac{1}{4}{{y}^{2}}\]
C) \[\frac{9}{49}{{x}^{2}}-\frac{3}{7}xy+\frac{1}{4}{{y}^{2}}\]
D) \[\frac{9}{49}{{x}^{2}}+\frac{3}{7}xy+\frac{1}{4}{{y}^{2}}\]
Correct Answer: C
Solution :
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