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24-Ruby IV

## Quadratic equation and a lsolve function

There is a quadratic algebraic equation. Is it possible, according to its coefficients a, b, and c, to form a system of two linear algebraic equations with the same roots as the quadratic equation?

Others word! Can I use the lsolve function for the solving a quadratic algebraic equation?

1 ACCEPTED SOLUTION

Accepted Solutions
24-Ruby V
(To:ValeryOchkov)

Equally unfair but a little bit nicer

7 REPLIES 7
23-Emerald I
(To:ValeryOchkov)

I used to work with older (back then) engineers who were adept at EXCEL and adverse to Mathcad,  We could get curve fits to polynomials by "creating" a column with the values for the other powers and using the EXCEL function "linest".  A similar trick should work for lsolve; that trick used in a least square matrix solver in Prime 4 is attached.

23-Emerald III
(To:Fred_Kohlhepp)

Nice exercise Fred, but I don't see it solve the quadratic, or am I missing something?

Luc

23-Emerald III
(To:ValeryOchkov)

I'm afraid not, Valery:

Success!
Luc

24-Ruby IV
(To:ValeryOchkov)

I use the lsolve function for the solving a quadratic algebraic equation?

Yes, we can!

24-Ruby V
(To:ValeryOchkov)

Equally unfair but a little bit nicer

Здравствуйте. Решал задачу в mathCad: методом наименьших квадратов рассчитать коэффициенты уравнения по результатам решения показаного в таблице полного двохуровневого трьохфакторного плана ПФЕ. Праподаватель сказал что есть ошибки, больше ничего не сказал, поможете?

24-Ruby IV
(To:IhorHuzar)

I think it will be better to write your question in English and put it here as new message!

And better to have comments in your Mathcad-sheet in English!

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