Q.

If A=4x+22x−3x+1 is an invertible matrix, then x cannot take value

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a

-1

b

2

c

3

d

none of these

answer is D.

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Detailed Solution

|A|≠0⇒4(x+1)−(2x−3)(x+2)≠0⇒2x2−3x−10≠0⇒x≠3±894
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If A=4x+22x−3x+1 is an invertible matrix, then x cannot take value