Dear Tejas, challenge ACCOMPLISHED! (Speed run, Uncut)
Why Mathematics Stack Exchange recommends it
Mathematics Stack Exchange users link it when a question involves infinitely nested radicals or the sqrt(5-x)=5-x^2 equation and they want a worked solution.
Recommended by 3 people across 3 different months, 2018 to 2020.
What it is
blackpenredpen (Steve Chow) solves the equation sqrt(5-x)=5-x^2 in a short uncut speed run, using an infinitely nested square root approach to find the extra solutions. It answers a challenge posed by a viewer named Tejas and links to a related video on treating the problem as a quadratic in 5.
What people said
Recommends For the love of maths · 2018-10 · Mathematics Stack Exchange · on “How to prove $\sqrt {a-\sqrt {a+\sqrt {a-\sqrt {a+\sqrt {a-\sqrt {a+\ldots}}}}}}=\frac {\sqrt {4a-3}-1}2$”
So, I was watching this [this video] video by blackpenredpen [LINK] where he mentions that $$\sqrt {a-\sqrt {a+\sqrt {a-\sqrt {a+\sqrt {a-\sqrt {a+\ldots}}}}}}=\frac {\sqrt {4a-3}-1}2$$ so I wanted to try and prove it myself. Let $\sqrt {a-\sqrt {a+\sqrt {a-\sqrt {a+\sqrt {a-\sqrt {a+\ldots}}}}}}=x$ But $\sqrt {a-\sqrt {a+\underbrace{\sqrt {a-\sqrt {a+\sqrt {a-\sqrt {a+\ldots}}}}}_x}}=x$ $\therefore \sqrt {a-\sqrt {a+x}}=x$ $a-\sqrt {a+x}=x^2$ $x^2-a=-\sqrt {a+x}$ $x^4-2ax^2+a^2=a+x$ $x^4-2ax^2-x+a^2-a=0$ Note that this is of the form $y^4+py^2+qy+r=0$ so we can use Ferrari-Cardano [LINK] . We need to find a $z$ such that $(2z-p)y^2-qy+(z^2-r)$ has a discriminant of $0$ . The discriminant of $(2z
Recommends Giraffes4thewin · 2020-04 · Mathematics Stack Exchange · on “A possible solution to $\sqrt {5-x}=5-x^2$ (without taking square from both sides)”
I can’t answer your question, but redpenblackpen posted a video on this exact problem you might want to check out. Here’s the link - [this video]
Recommends Aiden Chow · 2020-06 · Mathematics Stack Exchange · on “How to make inverse to work here?”
I found a [this video] video by a YouTuber named blackpenredpen [LINK] that explains how to solve for the second solution that you are seeking. He basically uses infinitely nested square roots instead of inverses but you might find it helpful.