Having problems in given-find method

[ptc-4354887]

I am new to Mathcad and i am trying hard to learn it. Anyway, i have a homework about quadratic spline interpolation and i have ten equations with 12 unknowns. however, by using the given-find method i always get an error message. i desparately need your help to do my homework

my work is attached.

[Fred_Kohlhepp · Accepted solution]

You have a typographical error in one of your constraints, instead of t.5 you have t.5.

Beyond that,

1. you need as many equations as unknowns for a unique solution.
2. The extra equations come from requiring the slopes at the knots to be the same.

Read up in help on solve blocks with attention to "minerr".

[ptc-4354887]

I don't know how can i thank to you. You made my day. The mistake was in t.5. and i wouldn't be able to realise it without you. i am fed up with doing such silly but important mistakes.

Thank you very much Fred Kohlhepp