Finding the basis for a set of polynomials (linear algebra)

  • Thread starter RossH
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  • #1
RossH
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Hi. Thanks for the help.

Homework Statement


Find a basis for the set of polynomials in P3 with P'(1)=0 and P''(2)=0.

Homework Equations


P' is the first derivative, P'' is the second derivative.


The Attempt at a Solution


The general form of a polynomial in P3 is ax^3+bx^2+cx+d
Therefore, P' will have the form 3ax^2+2bx+c
and P'' will have the form 6ax + 2b
Plugging in the known values, the two equations will be:
3a+2b+c=0
12a+2b+0c=0

I just don't know where to go from there, how to find the basis. I understand the concept of a basis and how to find one for a set of matrices or vectors, but not with this. Any help would be greatly appreciated. Thank you.
 

Answers and Replies

  • #2
RossH
75
0
Never mind. solved.
 

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