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Roots of $m^{2} + 7 m + 12 = 0$ are

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-3, 0

3, 4

-3, 4

-3, -4

answer is D.

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Detailed Solution

$m^{2} + 7 m + 12 = 0$

$m^{2} + 3 m + 4 m + 12 = 0$

$m (m + 3) + 4 (m + 3) = 0$

$(m + 3) (m + 4) = 0$

$m + 3 = 0 o r m + 4 = 0$

$m = - 3 o r - 4$

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