4. Which of the following is correct? a. (x – 3y)2 = x2 – 9y2
b. (x – 3y)2 = x2 +9y2
C. (x – 3y)2 = x2 - 6xy + 9y2
d. (x - 3y)2 = x2 + xy - 9y2
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4. Which of the following is correct? a. (x – 3y)2 = x2 – 9y2
b. (x – 3y)2 = x2 +9y2
C. (x – 3y)2 = x2 - 6xy + 9y2
d. (x - 3y)2 = x2 + xy - 9y2
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