Amarcord Federico Fellini and Mathcad (https://en.wikipedia.org/wiki/Amarcord):

[ValeryOchkov]

[ValeryOchkov]

I would like to use all Mathcad tools for the solution this problem:

 The author of the last solution will get the gift from me!

1.

[ValeryOchkov]

2.

[ValeryOchkov]

3.

[ValeryOchkov]

4.

[ValeryOchkov]

5.

[ValeryOchkov]

6.

[ValeryOchkov]

7.

[Raiko]

Good movie!

[LucMeekes]

In real Mathcad (11):

Luc

[ValeryOchkov]

My bisection

[ValeryOchkov]

Newton

[ValeryOchkov]

Secant Method

[ValeryOchkov]

We have used Find, root, MinErr, polyroots, Minimize and Maximize functions! 

We can use the lsolve function too! Why not! With Werner help!