What is a tangent to the parabola


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Q: The parabola y= x^2+4 has two tangents which pass through the point (0,-2). One is tangent to the parabola at (a, a^2+4) and the other at (-a, a^2+4) where a is a certain positive number. The question is a=?

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Mathematics: What is a tangent to the parabola
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