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First consider the auxiliary equation x2 - 4x - 12 = 0

This simplifies to (x + 2)(x - 6) = 0 which has root x = -2 and x = 6

Since the coefficient of x2 is positive, the inequality is satisfied between the roots that is, -2 < x < 6

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Q: What is the solution of x2-4x-12 is less than 0?
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