Question

If $A=\left|\begin{array}{ccc}x^{2}+x&x+1&x-2\\2x^{2}+3x-1&3x&3x-3\\x^{2}+2x+3&2x-1&2x-1\end{array}\right|$ = ax -12, then ‘a’ is equal to:
(a) 24
(b) –12
(c) –24
(d) 12

Answer 1

D)12

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