Copyright © University of Cambridge. All rights reserved.

'Root to Poly' printed from http://nrich.maths.org/

Show menu


Why do this problem?
It gives learners experience of algebraic manipulation of polynomials and working with surds. It is based on the fact that if you know one root of a polynomial then you know one of its factors.

Possible approach
This can be used as a lesson starter.

Key questions
We are looking for a polynomial in $x$, do you know any values of $x$ that satisfy the polynomial?

If you have an expression involving surds what can you try in order to get rid of the square roots?