A Nice Functional Equation 2

[@antik8867]

thanks for the video! I got to learn something new, which is you gotta find the input within the output

[@ignaciodecastrofondevila2456]

Thanks for your videos. Love when I resolve them.

[@ShortsOfSyber]

Glad you like them!

[@SidneiMV]

(2x - 1)/2 = u => x = (2u + 1)/2
f(u) = (2u + 1)²/4 - (2u + 1)/2
f(u) = (4u² + 4u + 1 - 4u - 2)/4
*f(u) = (4u² - 1)/4*