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Question

If x218x=62186, then x is equal to
a) 6
b) ±6
c) -6
d) zero

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Solution

Given, x218x=62186,
On expanding both determinants, we get
x×x18×2=6×618×2x236=3636 x236=0x2=36x=±6
So, (b) is the correct option.


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