HP 39g hp 39g+ (39g & 40g)_mastering the hp 39g+_English_E_F2224-90010.pdf - Page 91
Finding and accessing polynomial roots, POLYROOT, Matrix, Catalog
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Finding and accessing polynomial roots The POLYROOT function can be used to find roots very quickly, but the results are often difficult to see in the HOME view, particularly if they include complex roots. This can be dealt with easily by storing the results to a matrix. For example, suppose we want to find the roots of f (x) = x3 −3x2 + 3 . We will use the POLYROOT function and store the results into M1. The advantage of this is that you can now view the roots by changing to the Matrix Catalog. and pressing . See page 170 for more detailed information on matrices. In addition to this, you can access the roots in the HOME view as shown. Calculator Tip This trick is particularly helpful if you are working with complex roots. Not only does it make it easier to re-use them it makes it easier to tell at a glance which are real and which complex. 91