Note:sqrt denotes square root.

The value of the golden ratio is given by the equation

Φ=[1+sqrt(5)]/2

It is also given by the following radical equation. Demonstrate by calculation, by hand, that this is true.

Φ=sqrt(1+sqrt(1+sqrt(1+sqrt(1+…

 

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1 Answer

Φ = sqrt(1+sqrt(1+sqrt(1+sqrt(1+…

Φ^2 = 1+sqrt(1+sqrt(1+sqrt(1+…

Φ^2 - 1 = sqrt(1+sqrt(1+sqrt(1+…

And using the very first line,

Φ^2 - 1 = Φ

Φ^2 - Φ - 1 = 0

Using the quadratic formula,

Φ = (1 +/- sqrt(1^2 - 4(1)(-1)))/(2)

Φ = (1 +/- sqrt(1+ 4))/(2)

Φ = (1 +/- sqrt(5))/(2)

by Level 11 User (81.5k points)

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