book Maths Puzzle Numerical Ability

please help me solve this equation: 2x^2+4x=-2

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book Other Question

In triangle ABC, AD:DB=AE:EC
If AB = 25, AD = 19, and AE = 8, find EC
(Hint. First find DB by DB = AB - AD) S and T are the centers of their respective circles. The two circles are mutually tangent at point U. If segment RS = d, what is the radius of the smaller circle in terms of d and ?
Answer: d(cos - sin )

solution? thank you