The Unexpected Solution

One solution giives Phi = 1.618...

y = x + 1 y = x * x Phi = 1.618... Phi = -0.618...?

Derive Phi Graphically

Phi = -0.618?...

Where did this come from?

One solution giives Phi = -0.618...

Despite the oddity of this '~phi', if you consider the rectangle formed by the blue lines, the x axis, and the y axis, you'll see it's a Golden Rectangle with sides of ~phi (horizontally) and both ~phi * ~phi and ~phi + 1 (vertically).

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