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What must be added to 3x2 - 5x to make it a perfect square?

Question

What must be added to 3x2 - 5x to make it a perfect square?

Options

A) $$\frac{36}{25}$$

B) $$\frac{25}{36}$$

C) -$$\frac{25}{36}$$

D) -$$\frac{5}{6}$$

E) -$$\frac{6}{5}$$