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$$$\left[\begin{array}{cc}1 - \lambda & \frac{1}{5}\\\frac{1}{5} & 1 - \lambda\end{array}\right]$$$의 행렬식
관련 계산기: 여인수 행렬 계산기
사용자 입력
$$$\left|\begin{array}{cc}1 - \lambda & \frac{1}{5}\\\frac{1}{5} & 1 - \lambda\end{array}\right|$$$을(를) 계산하세요.
풀이
2x2 행렬의 행렬식은 $$$\left|\begin{array}{cc}a & b\\c & d\end{array}\right| = a d - b c$$$입니다.
$$$\left|\begin{array}{cc}1 - \lambda & \frac{1}{5}\\\frac{1}{5} & 1 - \lambda\end{array}\right| = \left(1 - \lambda\right)\cdot \left(1 - \lambda\right) - \left(\frac{1}{5}\right)\cdot \left(\frac{1}{5}\right) = \lambda^{2} - 2 \lambda + \frac{24}{25}$$$
정답
$$$\left|\begin{array}{cc}1 - \lambda & \frac{1}{5}\\\frac{1}{5} & 1 - \lambda\end{array}\right| = \lambda^{2} - 2 \lambda + \frac{24}{25} = \lambda^{2} - 2 \lambda + 0.96$$$A