A(0,3),B(k,0),and AB=5, find the positive value of K
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AB^2=(k^2+9)
5^2=k^2+9
25=k^2+9
k^2=16
k=4 or k=-4
5^2=k^2+9
25=k^2+9
k^2=16
k=4 or k=-4
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