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Question

In what range will 'x' lie, if x2 + 10x + 21 0?

A
x7 & x3
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B
-7 x < -3
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C
7x3
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D
-7 < x -3
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Solution

The correct option is C 7x3
x2 + 10x + 21 0
(x + 3) (x + 7) 0

So, -7 x -3.

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