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If matrix A=(abba)A=\left(\begin{array}{cc}a& b\\b& a \end{array}\right)A=(abba) satisfies
A2−10A+16I=0,A^2-10A+16I=0,A2−10A+16I=0,
where b>0b>0b>0 and I=(1001),I=\left(\begin{array}{cc}1&0\\0&1 \end{array}\right),I=(1001), what is the value of a−b?a-b?a−b?
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