CODEWITHSUNDEEP
ti-nspire
Gui Mendonça
Gui Mendonça

Reputation: 11

I've been trying to apply the polyRoots function with "TI-nspire cx" but it keeps returning an empty value, what is happening?

I've been able to use the polyRoots function since day one, but all of a sudden it stopped working and it keeps returning an empty result,does someone know what is happening? Thank you in advance! This is the return I get, I´ve put a very simple one so that I know it's not an input problem

Upvotes: 1

Views: 691

Answers (1)

Logan Tischler
Logan Tischler

Reputation: 115

The function polyRoots only returns the real-valued zeros of a polynomial. Instead, you can use cPolyRoots to include complex-valued zeros, which will -- in your case -- look something like this:

cPolyRoots(3*x^2+4*x+5,x)
                            {-2/3-sqrt(11)/3*i,-2/3+sqrt(11)/3*i}

In case you're not familiar with complex numbers, here's a Wikipedia article regarding them. Basically, i=sqrt(-1), which is a number that isn't present anywhere on the real number line; the real number line only includes negative infinity through positive infinity.

Upvotes: 0

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