When is $12x^2+7x-10$ negative?

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1. Find the range of values of \(x\) for which the expression \(12x^2+7x-10\) is negative.

2. Find the range of values of \(c\) for which the expression \(x^2+4x+c\) is always positive.

If a quadratic is always positive, what can be said about its roots?