Question

Part 1: What are the possible number of positive, negative, and complex zeros of f(x) = 2x3 – 5x2 – 6x + 4 ?
Part 2: Use complete sentences to explain the method used to solve this equation.

Answer 1

@precal

Answer 2

x^3 means you have a maximum of 3 solutions

Answer 3

I don't know what methods you have been taught

Answer 4

I any one that you are comfortable

Answer 5

can you look at the graph? I know many of them but that is not going to help you. If you quote something you have not been taught that is going to make you look as if you don't know what you are talking about

Answer 6

ok by my sketch you should be able to answer your own question, give it a try

Answer 7

counting the numbers of times they change signs

Answer 8

That is what we learned.....don't go ;(

Answer 9

I know my roots, but I want to learn how to do it ;) @precal

Answer 10

ok that has a name, what is that called

Answer 11

Descartes sign change theorem or something like that

Answer 12

yessssssss! that's the one!!

Answer 13

ok just describe how you discovered that you have 3 solutions

Answer 14

remember it is f(x) and then f(-x)

Answer 15

1 negative root and 2 positive roots

Answer 16

I counted how many times the positive changes and how many times the negative changes with (-x) going into x. This helped me find both positive and negative, but the complex I am struggling I will try to write a chart I used in a sec...

Answer 17

you don't have any complex for this one

Answer 18

this is an example of 1 negative and 2 complex solutions, you don't have that