单选题If x is a positive integer and (x-6)2 = 9, then x2 = ______.A3B9C16D36E49
单选题
If x is a positive integer and (x-6)2 = 9, then x2 = ______.
A
3
B
9
C
16
D
36
E
49
参考解析
解析:
If x is a positive integer and (x-6)2 = 9, the expression inside the parentheses must be equal to 3 or -3. If x-6=3, then x=9 and x2=81. But 81 is not one of the choices. If x-6=-3, then x=-3+6=3, so x2=9.
If x is a positive integer and (x-6)2 = 9, the expression inside the parentheses must be equal to 3 or -3. If x-6=3, then x=9 and x2=81. But 81 is not one of the choices. If x-6=-3, then x=-3+6=3, so x2=9.
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