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单选题
If (p-q)2=16 and pq=21, what is the value of (p+q)2?
A

16

B

37

C

84

D

100

E

121

参考答案

参考解析
解析：
Expand(p-q) 2=16：(p-q) 2=p2-2pq+q2=p2+q2-2×21=16, p2+q2=58.
Now expand (p+q)2: (p+q)2=p2+q2+2pq=58+2×21=100.
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