Question

Using complete sentences, explain how to find the zeros of the function f(x) = 2x3 – 9x + 3

Answer 1

u can use synthetic division. as far as my concern that is much easier

Answer 2

so f(x) is zero when x = 3/2 or 1

Answer 3

robz8 it is cubic!

Answer 4

How would you do it with synthetic?

Answer 5

Yes, it is cubic that is one of the major problems with solving it.

Answer 6

It's a messy problem

Answer 7

for example: –2x^5 + 6x^4 + 10x^3 – 6x^2 – 9^x + 4.

Answer 8

this is a depressed qubic(there is no x^2 term) and is not that bad, use Ferro method.

Answer 9

The Ferro method?

Answer 10

Italian mathematician

Answer 11

I believe someone suggested synthetic is it possible? If so how?

Answer 12

you need to guess a solution first with synthetic

Answer 13

sometimes that easy, sometimes that's not

Answer 14

http://www.purplemath.com/modules/synthdiv4.htm

Answer 15

http://www.sosmath.com/algebra/factor/fac11/fac11.html

Answer 16

you can skip the first part because there is no x^2 part, after that its just a buch of change in variables....not bad

Answer 17

Very interesting, but is it possible for synthetic?

Answer 18

this will work for x^4... as well

Answer 19

if you know a solution say a
then divide by (x-a)

Answer 20

but you must know a solution

Answer 21

there are other way depending of the coefficients where you can expand do some "tricks" but as far as a general method, ^^^^^^^ that one is the best and will work all the time.

Answer 22

or u can break it up