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3 and 4 .Determinants and Matrices
normal
If $px^4 + qx^3 + rx^2 + sx + t$ $\equiv$ $\left| {\begin{array}{*{20}{c}}{{x^2}\, + \,\,3x}&{x\, - \,1}&{x\, + \,3}\\{x\, + \,1}&{2\, - \,x}&{x\, - \,3}\\{x\, - \,3}&{x\, + \,4}&{3x}\end{array}} \right|$ then $t =$
A
$33$
B
$0$
C
$21$
D
none
Solution
Put $x = 0 \, \&$ then evaluate
Standard 12
Mathematics