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3 and 4 .Determinants and Matrices
normal
જો $a,b,c$ એ ભિન્ન અને સંમેય સંખ્યા હોય તો $\left| {\begin{array}{*{20}{c}}
{\left( {{a^2} + {b^2} + {c^2}} \right)}&{ab + bc + ca}&{ab + bc + ca}\\
{ab + bc + ca}&{\left( {{a^2} + {b^2} + {c^2}} \right)}&{\left( {bc + ca + ab} \right)}\\
{ab + bc + ca}&{\left( {ab + bc + ca} \right)}&{\left( {{a^2} + {b^2} + {c^2}} \right)}
\end{array}} \right|$ એ હંમેશા..
A
શૂન્ય
B
સંમેય $\&$ ધન
C
સંમેય $\&$ ઋણ
D
અસંમેય અને ધન
Solution
$\left|\begin{array}{lll}{a} & {b} & {c} \\ {b} & {c} & {a} \\ {c} & {a} & {b}\end{array}\right|\left|\begin{array}{lll}{a} & {b} & {c} \\ {b} & {c} & {a} \\ {c} & {a} & {b}\end{array}\right|$
$=\left|\begin{array}{lll}{a} & {b} & {c} \\ {b} & {c} & {a} \\ {c} & {a} & {b}\end{array}\right|^{2}=$ Rational and Positive
Standard 12
Mathematics