question_answer

Which of the following is the expansion of \[{{\left( \frac{3}{7}x-\frac{1}{2}y \right)}^{2}}?\]

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)       \[\frac{9}{49}{{x}^{2}}+\frac{3}{7}xy+\frac{1}{4}{{y}^{2}}\]