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The graphs of the equations y=x^2 and y=k-x^2,where k is a c

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The graphs of the equations y=x^2 and y=k-x^2,where k is a constant,are shown above.If the length of AB is an integer,which of the following CANNOT be the value of

A 2     B 8     C 12     D 18     E 32
k-x2=x2
x2=k\2
Because the length of AB is integer,then the value of x is integer,and so k\2 can not be 12.
再问: k-x2=x2
x2=k\2
这两个式子是什么意思
再答: ipad打不出平方符号 x2
是x的平方。