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  3. the parabola y = x +4 has two tangents which pass

The parabola y = x +4 has two tangents which pass through the point (0,...

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The parabola y = x +4 has two tangents which pass through the point (0, -4). One is tangent to the parabola at (A, A+4) and the other at (-A, A + 4). Find (the positive number) A.

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