If P left begin array cc x 3 amp x 2 x 1 amp x-... - JAMB Mathematics 2009 Question
If P (=\left[\begin{array}{cc}x+3 & x+2\
x+1 & x-1\end{array}\right]) evaluate x if |P| = -10
A
-5
B
-2
C
2
D
5
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Correct Option: D
(P=\left[\begin{array}{cc}x+3 & x+2\
x+1 & x-1\end{array}\right]) evaluate x if |P| = -10
(x+3)(x-1) - {(x+1)(x+2)} = -10
x2 - x + 3x - 3 - {x2 + 2x + x + 2} = -10
x2 + 2x - 3 - {x2 + 3x + 2} = -10
-x - 5 = -10
-5 + 10 = x
5 = x
∴x = 5
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