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Mathematics 17 Online
OpenStudy (sanra123):

find zeros of x^4-5x^3+3x^2+x=0

OpenStudy (sanra123):

@ganeshie8

OpenStudy (kiakat):

Do you know what the first step is to finding the zeros??

OpenStudy (sanra123):

No

OpenStudy (kiakat):

well whats the highest exponent in that equation?

OpenStudy (sanra123):

X^4

OpenStudy (kiakat):

right, so that means you're going to have for solutions or zeros for that equation. now do you know what Descartes rule of signs is??

OpenStudy (sanra123):

We never learned that rule

OpenStudy (sanra123):

?i only know synthetic division

OpenStudy (sanra123):

And the p and q thingy

OpenStudy (kiakat):

alright, give me one second

OpenStudy (sanra123):

Ok

OpenStudy (kiakat):

okay so you're using the rational root theorem (the p and q thingy XD)

OpenStudy (sanra123):

Hahahhaha Ok

OpenStudy (sanra123):

But then it's +-1/+-1

OpenStudy (sanra123):

Thenn don't know how to solve

OpenStudy (kiakat):

I dont think i've ever done one where its equal to zero actually

OpenStudy (kiakat):

because usually if you're using the RRT you find the possible numbers for x by finding the factors of the first term and the constant

OpenStudy (sanra123):

@ganeshie8 can u help me

OpenStudy (sanra123):

I know it's hard!

OpenStudy (kiakat):

hang on im still trying to figure this one out haha

OpenStudy (kiakat):

one of the zeros is zero. because if you plug in zero for x it comes out to 0=0

OpenStudy (kiakat):

and another of the zeros is 1 for the same reason, but I cant figure out the other two.

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