Question

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

Answer 1

Please help!

Answer 2

What does it mean when it says find the 0's?

Answer 3

x values that when plugged in, produce a value of zero

Answer 4

Oh.
Okay.

Answer 5

Thanks.

Answer 6

it means let f(x) = 0 then solve for x

Answer 7

How would I do that?

Answer 8

um thats what they are yes, but I would not put that as your answer. i think they are asking you to show the steps of solving x when y = 0.

Answer 9

Graph the function and find the x intercepts. OR Factor the equation and solve for f(x) = 0

Answer 10

simple f(x) = 2x^3 + 9x + 2

when f(x) = 0 then

2x^3 + 9x + 2 = 0

Answer 11

factor that out and you get your zeroes

Answer 12

once you get your values, check http://www.wolframalpha.com/input/?i=2x3+%E2%80%93+9x+%2B+3+%3D0 to see how it works

Answer 13

Lord victorius use the rational roots theorem and try the possible roots with sythetic division. if you get a remainder of zero then that is one root. according to fundamental theorem of algebra there are 3 zeroes so keep that in mind

Answer 14

do you want a demonstration example?

Answer 15

what are you doing in class? The AC method, the quadratic formula, or completing the square?

Answer 16

AC?
.

Answer 17

Yes, I would like an example.

Answer 18

okay let's say find the zeroes of x^2 + 4x + 3

i just equate it to zero

x^2 + 4x + 3 = 0

now i factor it out
(x+3)(x+1) = 0

now i equate the factors to 0

x + 3 = 0 so x = -3

x + 1 = 0 so x = -1

does that help?

Answer 19

Oh!
I get it, thanks!

Answer 20

welcome ^_^