单选题If (2y+ k) 2 =4y2-12y+ k2, what is the value of k?A 3B 1C -1D -2E -3

题目
单选题
If (2y+ k) 2 =4y2-12y+ k2, what is the value of k?
A

3

B

1

C

-1

D

-2

E

-3

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