Question:

The parabola y = x² +4 has two tangents which pass through

Last updated: 7/18/2022

The parabola y = x² +4 has two tangents which pass through

The parabola y = x² +4 has two tangents which pass through the point (0, -4). One is tangent to the parabola at (A, A²+4) and the other at (-A, A² + 4). Find (the positive number) A.